5分之3y加2.5分之y加4等于2.4y.0.5分之4x减1.5减0.02分之0.5x减0.08等于0.1分之1.2减x

网事虽疯2022-10-04 11:39:543条回答

5分之3y加2.5分之y加4等于2.4y.0.5分之4x减1.5减0.02分之0.5x减0.08等于0.1分之1.2减x加2.
要正确答案,第2个方程要写,原方程化简为,不要错误答案
0.5分之4x减1.5减0.02分之0.5x减0.08等于0.1分之1.2减x加2.

已提交,审核后显示!提交回复

共3条回复
奇妙人生 共回答了18个问题 | 采纳率100%
8x-25x-0.08=12-x=2
16x=-13.92
x=-0.87
1年前
铁戈525 共回答了2个问题 | 采纳率
8x-1.5-25x-0.08=12-x+2
-16x=-0.58
x=0.03625
1年前
hamdulla910 共回答了4个问题 | 采纳率
8x-1.5-25x-0.08=12-x+2
-16x=15.58
x=0.97375
1年前

相关推荐

2.5分等于多少秒1.2时=( )时( )分3吨80千克=( )吨
酷狗3111年前3
将豆浆进行到底 共回答了22个问题 | 采纳率77.3%
2.5*60=150秒
1.2时=( 1 )时( 12 )分
3吨80千克=( 3.08 )吨
单词拼写(共5小题,每空一词,每小题0.5分,满分2.5分)
单词拼写(共5小题,每空一词,每小题0.5分,满分2.5分)
小题1:Which country is going to h___________ the next Olympics?
小题2:Then she prepares reliable moves to use if a new situation a__________ .
小题3:A bomb e____________ suddenly by the roadside and destroyed the road and lots of cars.
小题4:A young boy was _____________ (攻击) by a dog while he was walking in the park.
小题5:The company ___________ (雇用) thirty people last month.
小豆丫头1年前1
2009失去的记忆 共回答了13个问题 | 采纳率84.6%
小题1:host     
小题2: appeared    
小题3: explored   
小题4:attacked   
小题5: employed 

第二部分:阅读理解(共20小题;每小题2.5分,满分50分)阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳

第二部分:阅读理解(共20小题;每小题2.5分,满分50分)
阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。
Proper arrangement of classroom space is important to encouraging interaction. Most of us have noticed how important physical setting is to efficiency and comfort in our work. College classroom space should be designed to encourage the activity of critical thinking.
We have entered the 21st century, but step into almost any college classroom and you step back in time at least a hundred years. Desks are normally in straight rows, so students can clearly see the teacher but not all their classmates. The message behind such an arrangement is obvious. Everything of importance comes from the teacher.
With a little imagination and effort, unless desks are fixed to the floor, the teacher can correct this situation and create space that encourage interchange among students. In small or standard-size classes, chairs, desks, and tables can be arranged in a variety of ways. The primary goal should be for everyone to be able to see everyone else. Large classes, particularly those held in lecture halls, unfortunately, allow much less flexibility.
Arrangement of the classroom should also make it easy to divide students into small groups for discussion or problem-solving exercises. Small classes with movable desks and tables present no problem. Even in large lecture halls, it is possible for students to turn around and form groups of four to six. Breaking a class into small groups provides more opportunities for students to interact with each other, think out loud, and see how other students’ thinking processes operate all essential elements in developing new modes of critical thinking.
In courses that regularly use a small group format, students might be asked to stay in the same small groups throughout the course. A colleague of mine, John, allows students to move around during the first two weeks, until they find a group they are comfortable with. John then asks them to stay in the same seat, with the same group, from that time on. This not only creates a comfortable setting for interaction but helps him learn students’ names and faces.
1. The primary purpose of desk rearrangement is _______.
A. for the teacher to divide students into small groups.
B. to make it possible for students to interact with each other.
C. for the teacher to find out how students think.
D. to give students more opportunities to practice speaking.
2. The expression “step back in time at least a hundred years” in Paragraph 2 is intended to convey the idea that _______.
A. there is not much change in educational idea over the past hundred years
B. critical thinking was encouraged even a century ago
C. college classrooms often remind people of their college life
D. a hundred years ago, desk arrangement in a classroom was quite different
3. The greatest advantage in allowing each student to find his own group might be that________
A. learning is made comfortable in this way
B. the teacher can easily remember students’ names and faces
C. the teacher saves the trouble in doing that
D. brighter students can help slower ones.
4. It is implied in the passage that ______.
A. students are allowed to changed groups throughout the course in John’s class
B. classroom interaction between students is essential to the teachers
C. a comfortable environment leads to higher working efficiency
D. new kinds of desks and chairs should be made
5. The author mentioned John in the last paragraph in order to ________
A. create a comfortable setting for interaction
B. introduce an approach of learning students’ names and faces easily
C. give an example that students stay in the same seat throughout the course.
D. describe a good seat-arrangement mode in courses with small group format.
断碎1年前1
黑大叔 共回答了21个问题 | 采纳率85.7%
小题1:B
小题2:A
小题3:A
小题4:C
小题5:D

第二部分:阅读理解(共20小题;每小题2.5分,满分50分)阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳


第二部分:阅读理解(共20小题;每小题2.5分,满分50分)
阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。
1. A visitor can apply for a free audio tour_______.
A. in the Courtyard B. in the State Apartments
C. at the Admission Center D. at St George’s Chapel
2. What is specially offered to visitors with kids?
A. A security guard. B. A pushchair.
C. A free toy. D. A baby carrier.
3. Who can get re-entry permits?
A. Visitors wishing to eat outside the Castle.
B. Visitors buying gifts in the castle shops.
C. Visitors buying water from the Courtyard.
D. Visitors eating outside St George’s Chapel.
4. Why arc visitors required to turn off their mobile phones?
A. To ensure the safety of others.
B. To ensure the security of the Castle.
C. To prevent them from disturbing others.
D. To prevent the use of the built-in cameras.
5. In the last part, a “working royal palace” refers to one __________.
A. still being constructed
B. still used by the royal family
C. where the Queen usually works
D. where works of art are on show
a_wei781年前1
alex89911 共回答了15个问题 | 采纳率80%
小题1:C
小题2:D
小题3:A
小题4:C
小题5:B

合里有一百枚硬币(1.2.5分)两分换五分,总数还有七十三枚,把一分换五分,总数三十三枚,原有五分多少枚?
美丽天使儿1年前1
907山风 共回答了18个问题 | 采纳率94.4%
两分换五分 5枚换2枚 换一次少3枚 换的次数(100-73)/3=9 2分有9*5=45枚
一分换五分 5枚换1枚 换一次少4枚 换的次数(73-33)/4=10 1分有10*5=50枚
5分有100-45-50=5枚
( )分比2.5分多20%;比30立方分米少30%的是( )立方分米?
gandaoyuan1年前1
veronica_s 共回答了23个问题 | 采纳率87%
(3 )分比2.5分多20%;比30立方分米少30%的是(21 )立方分米
翻译句子(共4小题;每小题2.5分,满分10分)
翻译句子(共4小题;每小题2.5分,满分10分)
小题1:令他十分高兴的是,他发现他的名字被包括在名单中。(过去分词作宾补)
____________________________________________________________________
小题2:每次我听他的讲座,我都觉得他的讲的话没有意义。(attend, sense)
____________________________________________________________________
小题3:是他的态度而不是他的能力应该受责备。(强调句)
___________________________________________________________________
小题4:如果你方便的话,务必在我到伦敦观光时做我的导游。(强调谓语)
____________________________________________________________________
tcl82661年前1
乱士骑侠 共回答了15个问题 | 采纳率73.3%
小题1:Much to his delight/To his great delight, he found his name included in the list.
小题2:Every time I attended his lecture, I found what he said made no sense.
小题3:It is his attitude rather than his ability that is to blame.
小题4:If it is convenient to / for you, do serve as my guide when I go sightseeing in London.


小题1:to one’s +名词 表示:让某人…的;前面可以用副词much,或者在名词前加great表示强调。
小题2:名词短语every time引导时间状语从句。固定词组:Make sense有意义,讲得通。
小题3:本题考查强调句型:it is/was 被强调成分 that/who其它成分
小题4:用do+动词原形表示强调。另外还考查了it is convenient to sb对某人来说是方便的。Convenient的主语不能是人。
翻译句子 (共4小题, 每小题2.5分, 满分10分)
翻译句子 (共4小题, 每小题2.5分, 满分10分)
根据所给的中文和括号内的语法提示, 把下面句子翻译成英语,写在答题卷相应的横线上。
71. 实话告诉你, 我被人家取笑是很尴尬的。(it作主语)
To tell you the truth, .
72. 如果我把黑色照相机和白色照相机做过比较,就不会选择那台黑色的了。(虚拟语气)
If I the black camera with the white,
        .
73. 找到了问题所在, 公交车司机向乘客道歉, 由于他让大家等了这么久。 (名词从句)
Finding ,the bus driver said sorry to the passengers for __________________________________________________________________.





















74. 直到废除奴隶制的时候,他才意识到黑人将得到彻底的解放。(被动语态)
Not until the slavery was got rid of
.
roseangel与s1年前1
鲁曦曦 共回答了13个问题 | 采纳率100%
71. it was embarrassing of me to be made fun of / laughed at
72. had compared, I would not have chosen the black one
73. where the problem was / lay in, keeping / having kept them waiting so long
74. did he realize that the black people would be completely liberated

根据情景,用适当的词语完成对话,每空一词。(每小题0.5分,共2.5分)
根据情景,用适当的词语完成对话,每空一词。(每小题0.5分,共2.5分)
A: Mary, what’s that in your hand?
B: It’s a 小题1: of my family.
A: May I have a look?
B: Sure. Here you are!
A: Oh, you have a big family. 小题2: is the woman in purple? Is she your mother?
B: No, it isn’t. It’s my aunt, my father’s 小题3: .
A: Is the girl your cousin?
B: Yes, she is. She is my aunt’s 小题4: .
A: Oh, she looks nice.
B: Yes, you are 小题5: .
qinzhi1231年前1
mn32201qqv 共回答了16个问题 | 采纳率100%
小题1:photo
小题2:Who
小题3:sister
小题4:daughter
小题5:right

2.5分之x分之520-x分之400=3
kate6151年前0
共回答了个问题 | 采纳率
单词拼写(根据首字母或中文写出单词的适当形式,每题0.5分,共2.5分):
单词拼写(根据首字母或中文写出单词的适当形式,每题0.5分,共2.5分):
小题1:My brother graduated from Nanjing University with a d__________ in Computer Science.
小题2:Having had a good sleep and a good meal, he felt thoroughly _________(恢复精力).
小题3:His uncle was one of the __________(生还者)from the earthquake.
小题4:The frightened child _________(退缩) into the corner when he saw a snake .
小题5:My roommate got a s_________ from school for breaking the school rule.
签约kk1年前1
我的城市没有雨 共回答了13个问题 | 采纳率100%
小题1:Diploma
小题2:refreshed
小题3:survivors
小题4:shrank/shrunk
小题5:suspension

(共5小题,每小题2.5分,满分12.5分)
(共5小题,每小题2.5分,满分12.5分)
根据对话内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Taking good notes is a time-saving skill that will help you to become a better student in several ways. 1 . Second, your notes are excellent materials to refer to when you are studying for a test. Third, note-taking offers variety to your study time and helps you to hold your interest.
You will want to take notes during classroom discussions and while reading a textbook or doing research for a report. ____ 2_____. Whenever or however you take notes, keep in mind that note-taking is a selective process._____ 3______.
The following methods may work best for you.
●Read the text quickly to find the main facts and ideas in it.
●Carefully read the text and watch for words that can show main points and supporting facts.
●Write your notes in your own words.
●_____ 4_____.
●Note any questions or ideas you may have about what was said or written.
As you take notes, you may want to use your own shorthand(速记). When you do, be sure that you understand your symbols and that you use them all the time._____ 5_____.
A.Use words , not complete sentences.
B.There are three practical note-taking methods.
C.You must write your notes on separate paper.
D.Otherwise, you may not be able to read your notes later.
E. You will also want to develop your own method for taking notes.
F. That means you must first decide what is important enough to include in your notes.
G. First, the simple act of writing something down makes it easier for you to understand and remember it.
w会飞的鱼1年前1
风干的骄阳 共回答了31个问题 | 采纳率90.3%
小题1:G
小题2:E
小题3:F
小题4:A
小题5:D

(2.5分之X-3分之x)处以2=24
(2.5分之X-3分之x)处以2=24
带除法的怎么算?
请一步一步解出来
括号内2.5分之X减3分之X括号外除以2=24
xxnn81年前1
yllegend 共回答了18个问题 | 采纳率88.9%
首先,方程两边同时乘以2得2.5分之X减3分之X等于48
然后,2.5与3通分后两式合并得7.5分之0.5X等于48
其次,在此方程两边同时乘以7.5去分母得0.5X等于360
最后,方程两边同时除以0.5得X等于720
三分之x=24分之4.825:0.4=75:x2.5分之x=4.
铭万人1年前1
指间独舞 共回答了24个问题 | 采纳率87.5%
(1)三分之x=24分之4.8
x=8分之4.8=0.6
(2)25x=30
x=6/5
(3)x=18*2.5 /4.5
=45/4.5
=10
(2.5分)下图是A、B、C三种物质的溶解度曲线。请回答:
(2.5分)下图是A、B、C三种物质的溶解度曲线。请回答:

⑴t 1 ℃时,A、B、C三种物质的溶解度由大到小的顺序是
⑵当A中混有少量B时,可用 方法提纯A;
⑶t 2 ℃时,在100g水中放入 克A物质恰好形成饱和溶液, 此时溶液中溶质的质量分数为
⑷将C物质的不饱和溶液转变成饱和溶液的方法是
冰蝶冷清秋1年前1
wo是小白脸 共回答了20个问题 | 采纳率95%
⑴C>B>A    ⑵降温结晶     ⑶ 60     37.5%     ⑷升温或蒸发溶剂或增加溶质

1.x+7分之x+2=二分之一 2.5分之4x-6=三分之2x+1
黑客入侵1年前2
星星120 共回答了23个问题 | 采纳率95.7%
1、两边乘以2(x+7)得
2x+4=x+7
2x-x=7-4
∴x=3
检验:x=3是方程的解
∴方程的解是x=3

2、两边乘以15得
12x-18=10x+5
12x-10x=5+18
2x=23
∴x=23/2
第二部分 阅读理解(共20小题:每小题2.5分,满分50分)阅读下列短文,从每题所给的四个选项A、B、C、D四

第二部分 阅读理解(共20小题:每小题2.5分,满分50分)
阅读下列短文,从每题所给的四个选项a、b、c、d四个选项中,选出最佳选项。
a
edinburgh zoo makes plans to bring a pair of giant pandas from china to scotland. representatives from edinburgh zoo have recently returned from china, where they signed a letter of intent(意向书)making a promise to bring giant pandas to the zoo.
it has been suggested that the breeding pair should be on loan(暂借)to the royal zoological society of scotland (rzss) for 10 years and it is hoped they would give birth to babies during that time. edinburgh zoo would be the eighth zoo in the western hemisphere(半球)to care for the species if the project goes ahead.
zoo chiefs said that looking after the endangered animals could benefit conservation. david windmill, chief executive(主管)of rzss, said, “it is an opportunity to work on a global level with other conservationists to gain a better understanding of the giant panda, the threats they face, and what we can do to ensure their survival.”
at present, there are currently only around 1,500 giant pandas in the wild. rzss has been working on the project for almost a year, and hopes to have giant pandas at edinburgh zoo by 2009, the year of the society’s centenary(一百年纪念日).
mr. windmill said that the project has received strong support from the uk and scottish ***s and that this must continue if the zoo is to reach an agreement with the chinese. as part of the proposed agreement with the chinese ***, edinburgh zoo will cooperate on research projects benefiting conservation in the wild.
rzss will also provide considerable money to support giant panda conservation projects in the wild. giant pandas live in a few mountain ranges in central china and feed almost wholly on bamboo, which makes up 99% of the their diet.
36. what result did zoo representatives get from china?
a. a breeding pair is on loan to rzss for ten years.
b. china promised to sell two giant pandas before 2009.
c. they signed a letter of intent about giant pandas to be loaned to edinburgh zoo.
d. china promised to offer the money but not the experts for research into giant pandas.
37. if edinburgh zoo can borrow giant pandas, what will happen?
a. rzss will celebrate its centenary in 2009.
b. scotland will be the eighth country to have giant pandas.
c. rzss will have a better understanding of living habits of giant pandas.
d. edinburgh zoo will be the eighth zoo to have chinese pandas in the world.
38. the underlined part “the project” in paragraph 4 refers to “__________”.
a. the celebration of rzss’s centenary
b. introducing giant pandas to rzss’s collection
c. the royal zoological society of scotland itself
d. borrowing giant pandas from china for conservation
39. at present what seems to be the key factor for giant pandas to successfully go to edinburgh zoo?
a. rzss’s attitude. b. the chinese ***’s attitude.
c. edinburgh zoo’s support. d. the scottish ***’ attitude.
40. the best title for this passage would be “___________”.
a. edinburgh zoo expects giant pandas from china
b. edinburgh zoo does research into giant pandas
c. scotland supports giant panda conservation
d. giant pandas live happily at edinburgh zoo
相心人尔1年前1
GTTee 共回答了22个问题 | 采纳率95.5%
36-40 CCDBA

请根据中文提示,用词组的适当形式填空,每空一词。(2.5分)
请根据中文提示,用词组的适当形式填空,每空一词。(2.5分)
小题1:We ______ the woman ______(错把----当作---)our English teacher yesterday .
小题2:He _________ his bag ________ (用---填满) books just now .
小题3: Computers are widely used in people’s ________ ________ ( 日常生活 )
小题4:We’re _________ _________ (考虑) where to go for the winter holiday .
小题5:_______ _______ (实际上) , he is a good doctor.
shiyipu8410241年前1
flybic 共回答了22个问题 | 采纳率95.5%
小题1:mistook , for
小题2:filled with
小题3:everyday/ daily life
小题4:thinking about
小题5:In fact

解方程:2.4- 2.5分之y-4=3/5y
解方程:2.4- 2.5分之y-4=3/5y
2.4-(y-4/2.5)=3/5y
快乐大眼猫1年前3
lm1963 共回答了31个问题 | 采纳率93.5%
两边同乘以5
12-5(y-4)/2.5=3y
12-2(y-4)=3y
12-2y+8=3y
移项
3y+2y=12+8
5y=20
y=20÷5
y=4
在一次测验中,李华共回答了20道题,他答对一道得5分,答错一道扣2.5分已得85分问一共答对几道
睡个迷糊觉1年前1
酉水钓翁 共回答了18个问题 | 采纳率100%
答对一道得5分,(答错一道少得分数=答错一道扣2.5分+答错一道少得5分=7.5分)
共扣分数=100-85=15分
一共答错题数=15÷(5+2.5)=2道
一共答对了20-2=18道
刘斌期中考试成绩中,数学科和英语科的平均分是93.分1语文科成绩公布后,平均分下降了2.5分,刘斌语父考了多少多?(列式
刘斌期中考试成绩中,数学科和英语科的平均分是93.分1语文科成绩公布后,平均分下降了2.5分,刘斌语父考了多少多?(列式计算)
ebayone1年前1
onlySpArK 共回答了18个问题 | 采纳率83.3%
93一(3x2.5)=85.5
下表是篮球兴趣小组40名同学参加投篮比赛的成绩表每人投五次投中一次得1分已知全组的平均成绩是2.5分问投中3球和5球的各
下表是篮球兴趣小组40名同学参加投篮比赛的成绩表每人投五次投中一次得1分已知全组的平均成绩是2.5分问投中3球和5球的各有几人
ricehaha1年前1
洛竺雨薇 共回答了13个问题 | 采纳率92.3%
29人.
利用“知至少投进3个球的人平均每人投进6个球,投进的球少于8球的人平均每人投进3个球.”和总投进球个数相等.
可列出方程,设x为总人数,有
(x - 5 - 4)* 6 + 1*5 + 2*4 = (x - 3 - 4 - 1)*3 + 8*3 + 9*4 + 10*1
解得x=29
在数学竟赛中,一共20道题,每答对一题得五分,每答错一题扣2.5分小明得了85分,他答错了几道题?
mzdwq1年前4
fieje 共回答了4个问题 | 采纳率25%
(100-85)÷2.5
小玲准备炒一个西红柿鸡蛋的菜,她洗切西红柿用了1.5分,洗葱切葱用了2.5分,敲蛋打蛋用了2分,洗锅2分,把锅烧热1分,
小玲准备炒一个西红柿鸡蛋的菜,她洗切西红柿用了1.5分,洗葱切葱用了2.5分,敲蛋打蛋用了2分,洗锅2分,把锅烧热1分,将油烧热用3分,炒4分,小玲烧好这道菜花了16分.请你巧妙安排,设计出一个顺序,使烧好这道菜的时间最短.
东方之小猪1年前1
一根葱 共回答了14个问题 | 采纳率92.9%
解题思路:根据题干,在把锅烧热及把油烧热的同时,可以进行洗切西红柿和洗切葱花,由此即可设计出.

先把锅洗好,敲打鸡蛋,在把锅烧热及把油烧热的同时,洗切西红柿和洗切葱花,然后可以炒西红柿鸡蛋了.按上面步聚进行只需时间是:

2+2+1+3+4=12(分).
答:按上述顺序烧菜的时间最短,是12分钟.

点评:
本题考点: 最佳方法问题.

考点点评: 此题是合理安排时间的问题,奔着如何安排最能节约时间又不使各个程序相互冲突,进行合理设计,是解决此类题目的中心思想.

解方程:5分之3y+2.5分之(y+4)=2.4y
BUYBIRD1年前3
鹿野仙踪 共回答了20个问题 | 采纳率85%
3/5y+(y+4)/2.5=2.4y
同时乘以5,得
3y+2(y+4)=12y
3y+2y+8=12y
7y=8
y=8/7
7.8千克=()克 3时=()分 300分=()时 2.5分=()秒 1800秒=()分 2时=()秒 3时20分=()
7.8千克=()克 3时=()分 300分=()时 2.5分=()秒 1800秒=()分 2时=()秒 3时20分=()分
lois_8110211年前3
止是一条鱼 共回答了20个问题 | 采纳率100%
7.8千克=(7800)克 3时=(180)分 300分=(5)时 2.5分=(150)秒 1800秒=(30)分 2时=(7200)秒 3时20分=(200)分
游乐场的溜冰滑道如图.溜冰车上坡每分行400米,下坡每分行600米.已知从A点到B点需3.7分,从B点到A点只需2.5分
游乐场的溜冰滑道如图.溜冰车上坡每分行400米,下坡每分行600米.已知从A点到B点需3.7分,从B点到A点只需2.5分.问:AC比BC长多少米?
逗你玩啊1年前0
共回答了个问题 | 采纳率
有一次智力测试中王涛共做了20道判断题他每答对一道题得5分每答错一道题道扣2.5分已知王涛得了85分他打错了几道题?
魅力海南1年前10
风遗言 共回答了11946个问题 | 采纳率0.6%
6道,100—85=15 15➗2.5=6
(2.5分)A、B、C、D、E为初中化学常见五种不同类别的物质,它们之间的关系如下图所示(“—”表示相连的两种物质能发生
(2.5分)A、B、C、D、E为初中化学常见五种不同类别的物质,它们之间的关系如下图所示(“—”表示相连的两种物质能发生反应,“→”表示一种物质转化成另一种物质。反应条件、部分反应物和生成物已略去)。若A、B、C均含有相同金属元素,B→C反应放出大量热,E是相对分子质量最小的物质,请回答下列问题:

⑴请写出物质A、C的化学式:
A ,C
⑵请写出D→E反应的化学方程式 ,该反应的基本反应类型为

upendi_chen1年前1
lanidea 共回答了14个问题 | 采纳率85.7%
⑴ A CaCO 3 Ca(OH) 2
⑵Fe+2HCl===FeCl 2 + H 2 ↑置换反应


试题分析:解答框图式的推断题,要找出解题的突破口,或者说是“题眼”,常见的“题眼”有:特殊的物质颜色,特殊的反应条件及反应现象,甚至特殊的反应类型等,由于A、B、C、D、E为初中化学常见五种不同类别的物质,E是相对分子质量最小的物质,即氢气,是单质,那么可以判断D应为酸,而A、B、C均含有相同金属元素,B→C反应放出大量热,可以推断应该都含金属元素钙元素,A应为碳酸钙,B为氧化钙,C为氢氧化钙,
(1)物质A的化学式:CaCO 3 ,C的化学式:Ca(OH) 2
(2)由于D是酸,E是氢气,所以D→E反应的化学方程式:Fe+2HCl===FeCl 2 + H 2 ↑,该反应的基本反应类型:置换反应
第三部分 阅读理解(共20小题:每小题2.5分,满分50分)阅读下列短文,从每题所给的四个选项A、B、C、D四

第三部分 阅读理解(共20小题:每小题2.5分,满分50分)
阅读下列短文,从每题所给的四个选项A、B、C、D四个选项中,选出最佳选项。
Today, as in every other day of the year, more than 3000 U.S. adolescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime, it can be expected that of these 3000 about 23 will be murdered, 30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweighs all other factors, whether voluntary or involuntary, as a cause of death.
Since the late 1970s, when daily smoking among high school seniors reached 30 percent, smoking rates among youth have declined. While the decline is impressive, several important issues must be raised.
First, in the past several years, smoking rates among youth have declined very little. Second, in the late 1970s, smoking among male high school seniors exceeded that among female by nearly 10 percent. The statistic is reversing. Third, several recent studies have indicated high school dropouts have excessively high smoking rates, as much as 75 percent.
Finally, though significant declines in adolescent smoking have occurred in the past decade, no definite reasons for the decline exist. Within this context, the National Cancer Institute (NCI) began its current effort to determine the most effective measures to reduce smoking levels among youth.
36. According to the author, the deaths among youth are mainly caused by __________.
A. traffic accidents B. smoking-related disease
C. murder D. all of these
37. Every day there are over ______ high school students who will become regular smokers.
A. 750 B. 23 C. 30 D. 3000
38. By “dropout” the author means __________.
A. students who failed the examination B. students who left school
C. students who lost their way D. students who were driven out of school
39. The reason for declining adolescent smoking is that __________.
A. NCI has taken effective measures
B. smoking is prevented among high school seniors
C. there are many smokers who have died of cancer
D. none of these
40. What is implied but not stated by the author is that __________.
A. smoking rates among youth have declined very little
B. there are now more female than male smokers among high school seniors
C. high smoking rates are due to the increase in wealth
D. smoking at high school is from low socio-economic backgrounds
就算青蛙吧1年前1
芙蓉绣缨花 共回答了18个问题 | 采纳率88.9%
36-40 BDBDB
小题1:
小题2:
小题3:
小题4:
小题5:
小题6:

(2.5分之x-1)-(1.25分之x)等于1.2
(2.5分之x-1)-(1.25分之x)等于1.2
(2.5分之之x减1)-(1.25分之x)等于1.2怎么算
crs19151年前2
秋风难忘 共回答了20个问题 | 采纳率80%
根据对话的情景,从方框中选择适当的句子完成对话,使对话完整通顺。其中有两项是多余的。(每小题0.5分,共2.5分)
根据对话的情景,从方框中选择适当的句子完成对话,使对话完整通顺。其中有两项是多余的。(每小题0.5分,共2.5分)
A: Leo, I don’t want to cook lunch.
B: 小题1:
A: Good idea! Let’s go.
(They are in the Chinese restaurant.)
C: 小题2:
A: Yes, some rice, fish and vegetables, please.
C: Would you like something to drink?
A: Yes. A glass of orange juice. What about you, Leo?
B: I’d like a glass of water.
C: 小题3:
B: Some jiaozi, please.
C: Would you like some chicken? It ’s very nice.
A: 小题4: That’s all.
C: OK. 小题5:
A. I’d like something to drink.
B. May I help you?
C. No, thanks.
D. What would you like to eat?
E. That’s all right.
F. What about going to that Chinese restaurant?
G. Thank you.
dongdiao1年前1
怀念春天的 共回答了13个问题 | 采纳率69.2%
小题1:F
小题2:B
小题3:D
小题4:C
小题5:G

用括号中所给词的适当形式填空。(2.5分)
用括号中所给词的适当形式填空。(2.5分)
小题1:What ________ you _______ ( do ) from eight to ten yesterday morning ?
小题2: The music_________ ( sound ) great .
小题3:Would you mind ______________ ( not smoke ) here ?
小题4:They learned Japanese by ________( they ) last year .
小题5:Several _________( science ) took part in the important meeting yesterday .
光棍鸡1年前1
zzzeeezzz 共回答了20个问题 | 采纳率85%
小题1:were doing
小题2:sounds
小题3:not smoking
小题4:themselves
小题5:scientists

1961年5月22日发生在智利的8.9级地震是世界上有仪器记录的最大地震.()(2.5分)A、正确B、错误
kogogo1年前1
hixuewawa 共回答了25个问题 | 采纳率100%
可选B,因为2011年3月11日东日本大地震的震级是9级.但我拒绝认可.因为东日本大地震一开始的监测数据显示为8.8级,而不是后来确认的9级.因此也可选A.
小胖期中考试语文的成绩比三门主课的平均分低7.5分,英语比三门主课的平均分低2.5分,那么数学成绩比英语成绩高()风.
wyhh1年前1
ss黃頁 共回答了15个问题 | 采纳率93.3%
设语文为a,数学为b,英语为c
则a=(a+b+c)/3-7.5
c=(a+b+c)/3-2.5
所以a+c=(2a+2b+2c)/3-10
所以b=(a+b+c)-(a+c)
=(a+b+c)/3+10
所以b-c=12.5
根据对话内容选择恰当的句子补全下列对话,其中2项多余。(0.5×5=2.5分)
根据对话内容选择恰当的句子补全下列对话,其中2项多余。(0.5×5=2.5分)
A: Good evening, madam. Welcome to our restaurant.
B: Good evening.小题1:?
A: OK. Here it is.
B: Thank you.
(A few minutes later)
A: 小题2:, madam?
B: Sure. I’ll have noodles and can I have a salad ?
A: Sure. We have green salad, fruit salad and chicken salad. 小题3:?
B: A green salad, please.
A: 小题4:?
B: Yes. Coke, please.
A: OK.Anything else ?
B:小题5:.
A: OK. I’ll be back soon with your food and drink.
孤峰月影1年前1
天上流歆 共回答了12个问题 | 采纳率91.7%
小题1:B
小题2:F
小题3:D
小题4:G
小题5:A

语文考试成绩分析我考了93分,成语填空扣了2.5分,阅读扣了2.5,作文扣了1分,写省略号的意思扣了1分,要写500字左
语文考试成绩分析
我考了93分,成语填空扣了2.5分,阅读扣了2.5,作文扣了1分,写省略号的意思扣了1分,要写500字左右。
wo74nvren1年前1
micbird 共回答了10个问题 | 采纳率70%
几年极?初中的话你作文不错啊!!应该说很好了!小学的话差了点!
数学竞赛有40道题,算对一道给2.5分,算错一道倒扣1.5分,结果王刚得60分,他错了几道题?
超级女生yy1年前1
小猫mm790801 共回答了19个问题 | 采纳率100%
假设王刚40题全部做对,则做错了:
(2.5×40-60)÷(2.5+1.5),
=40÷4,
=10(道),
答:王刚做错了10道.
(各2.5分,共5分).取一定量的Na 2 CO 3 和Na 2 SO 4 混合物溶液与过量盐酸反应,生成2.016 L
(各2.5分,共5分).取一定量的Na 2 CO 3 和Na 2 SO 4 混合物溶液与过量盐酸反应,生成2.016 L CO 2 (标况下),然后加入足量的Ba(OH) 2 溶液,得到沉淀的质量为2.33 g。试计算混合物中Na 2 CO 3 和Na 2 SO 4 的物质的量分别为多少。
王轶列1年前0
共回答了个问题 | 采纳率
一、填空1.一个比的比值是2,且前项、后项、比值、三个数之和是11,这个比是():()2.5分之X的倒数是4分之3,X的
一、填空
1.一个比的比值是2,且前项、后项、比值、三个数之和是11,这个比是():()
2.5分之X的倒数是4分之3,X的倒数是()
二、应用题
1.把一个高3分米的圆柱体底面平均分成若干个扇形,然后切开,再拼成一个近似长方体,长方体的表面积比圆柱体增加120平方厘米,求原圆柱体的体积
2.甲乙同时从AB两市相对开出,经过3小时,在离中点18千米处相遇,这时甲乙所行的路程比为2:3,甲乙每小时各行几千米?
yfz0011年前10
西北偏西北 共回答了17个问题 | 采纳率100%
一、
1.6:3=2
2.1/(x/5)=3/4
X=20/3
1/X=3/20
二、
1.由已知,2πRR+2πRH+120=2R*πR+2RH+2πRH
解得RH=120
又H=30
所以R=2
所以V=πRRH=3.14*2*2*30=376.8(平方厘米)
2.设甲速度为X,乙速度为Y,甲乙所行路程比为2:3,因此乙速度快.
两人在距离中点18千米处相遇,因此
3Y-3X=18*2=36
又路程比为2:3,因此
3Y:3X=2:3
解得3Y=108,3X=72
Y=36,X=24
甲每小时行24千米,乙每小时行36千米.
数学竞赛共40题对一题得2.5分错一题扣1.5分小红得了80分对了几题?算式是?
candyania1年前3
菁菁_百合 共回答了22个问题 | 采纳率95.5%
2.5x-1.5(40-x)=80
2.5x-60+1.5x=80
4x=140
x=35
沉积相 求高手多选题 (共13道题)收起12.(2.5分) 重力流形成条件包括:( )。 A、较大的水深 B、足够的坡度
沉积相 求高手
多选题 (共13道题)
收起
12.(2.5分) 重力流形成条件包括:( )。
A、较大的水深
B、足够的坡度和密度差
C、充沛的物源
D、触发机制
13.(2.5分) 重力流的基本类型可根据形成环境和成因特征,划分为( )。
A、泥石流
B、碎屑流
C、海相重力流
D、陆相重力流
14.(2.5分) 滑动、滑塌与沉积物液化的证据有( )。
A、包卷层理
B、平行层理
C、滑塌构造
D、重荷模
15.(2.5分) Wilson(1975)碳酸盐岩综合相模式中的开阔陆鹏相的主要岩石类型有( ) 。
A、富含化石的灰岩
B、砂岩
C、页岩
D、泥灰岩
16.(2.5分) 海水的水动力作用包括以下哪种形式( )。
A、波浪
B、潮汐
C、漩涡
D、海流
17.(2.5分) 下列哪种因素可引起海流运动?( )。
A、地球重力场变化
B、温度变化
C、盐度分布不均
D、降雨
18.(2.5分) 海洋沉积相可划分为( )。
A、滨海相
B、浅海相
C、半深海相
D、深海相
19.(2.5分) 海岸沙丘的沉积特征包括:( )。
A、沉积物细-中粒
B、成熟度低
C、重矿物富集
D、具大型交错层理
20.(2.5分) 后滨亚相的沉积特征包括:( )。
A、具平行层理
B、粒度较沙丘带粗
C、生物介壳凸面朝上
D、磨圆分选较好
21.(2.5分) 前滨亚相沉积特征包括:( )。
A、分选较好
B、冲洗层理发育
C、常见生物扰动构造
D、砾石扁平面倾向指示大海中央方向
22.(2.5分) 临滨亚相沉积特征包括:( )。
A、常发育沿岸沙坝
B、地形越平缓越有利沙坝发育
C、上部发育有大量的泥质沉积物
D、高能沉积区有利于沙坝沉积
23.(2.5分) 在半深海主要沉积类型包括:( )。
A、重力流
B、等深流
C、热对流
D、悬浮沉积
24.(2.5分) 重力流形成特征包括:( )。
A、阵发性
B、含大量悬浮物质
C、杂基支撑
D、具侵蚀作用
zsz611年前1
ww比爱更美好 共回答了11个问题 | 采纳率90.9%
12.ABCD 13.CD 14.ACD 15.暂时不知道答案 16.ABD 17.ABC 18.ABCD 19.ABCD 20.ABCD 21.ABCD 22.暂时不知道答案 23.ABD 24.ABCD
有两个不知道答案 找到了 补给你
小兰和小芳同时从环形跑道上的一点向相反方向走去,小兰每分走65米,小芳每分走75米,经过2.5分相遇.这个环形跑道全长是
小兰和小芳同时从环形跑道上的一点向相反方向走去,小兰每分走65米,小芳每分走75米,经过2.5分相遇.这个环形跑道全长是多少米?
zirui11年前4
yctd_328 共回答了14个问题 | 采纳率92.9%
解题思路:用小兰的速度加上小芳的速度,求出两人的速度和,再乘两人的相遇时间,就是环形跑道的全长.据此解答.

(65+75)×2.5,
=140×2.5,
=350(米).
答:环形跑道全长350米.

点评:
本题考点: 简单的行程问题.

考点点评: 本题的关键是求出两人的速度和,再根据路程=速度×时间这一数量关系解答.

一次数学测验共有20道题,每答对一道题得5分,每答错一道倒扣2.5分.小灿得了85分她答错了几道题?
swordlulj1年前1
xiaoguan08 共回答了16个问题 | 采纳率100%
假设答对了X道,答错了Y道.则:
X+Y=20
2.X*5-Y*2.5=85.


解出这个方程式得
Y=2,X=18.
所以打错了2道题.
小强、小新、小涛参加奥运长跑比赛.小强3分跑950米,小新2.5分跑650米,小涛4分跑1330米,谁最快
rsqr1年前4
wangjie2006 共回答了15个问题 | 采纳率100%
小涛 1330/4>小强 950/3>小新650/2.5