（ ）﹕5＝9∶（）＝二十分之多少等于三十分之多少＝0.6 48的（）是18.36是（）三分之二

四分之三等于27/36等于3除4等于二十分之15等于（ 0.75）{最后一个填小数}

1.went,will come
2.will win
3.to study
4.maening
5.are
1.how soon will
2.what will,be like
3.will be,in five years
4.what
5.won't be

一小时二十分等于4/3小时

1/6=1/2-1/3
1/12=1/3-1/4
.
=1-【（1/2-1/3）+（1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)-(1/10-1/11)
=1-(1/2-1/11)
=13/22

M、N、F分别为BO、CO、BC的中点△ABC中,ED∥BC△OBC中,MN∥BC所以ED∥MN△ABO中,EM∥AO△ACO中,DN∥AO所以EM∥DN因此四边形EMND为平行四边形OD=OM又OM=MB所以OD=OM=MB,OD=1/3BD 第二问是证明三角形的三条中线交于一点,证明方法很多,你看附件吧

A long time ago there was a king and queen who said every day,"Ah,if only we had a child," but they never had one.
And finally the queen had a little girl who was so pretty that the king could not contain his joy,and ordered a great feast.When it came to an end,thirteen wise women came to bestow magical gifts upon the baby.
When eleven of them had made their promises,suddenly the thirteenth came in.She wished to avenge herself for not having been invited,and she cried with a loud voice,"The king's daughter shall,in her fifteenth year,prick herself with a spindle,and fall down dead."
They were all shocked,but the twelfth,whose good wish still remained unspoken,came forward,and as she could not undo the evil sentence,but only soften it,she said,"It shall not be death,but a deep sleep of a hundred years,into which the princess shall fall."
The king,who wanted to keep his dear child from the misfortune,gave orders that every spindle in the whole kingdom should be burnt.
It happened that on the very day when the princess was fifteen years old,she climbed up a narrow,winding staircase in the castle and reached a little door.In the room sat an old woman with a spindle,busily spinning her flax.
"Good day,old mother," said the king's daughter,"What sort of thing is that,that rattles round so merrily," said the girl,and she took the spindle and wanted to spin too.But scarcely had she touched the spindle,she pricked her finger with it.And,she fell down and lay in a deep sleep.And this sleep extended over the whole palace.
Around about the castle there began to grow a hedge of thorns,which every year became higher,and at last grew all over the castle.
The story went about,and from time to time kings' sons came and tried to get through the thorny hedge into the castle.But the youths were caught in the hedges and died a miserable death.
Then a hundred years had just passed,and the day had come when the princess was to awake again.When a king's son came near to the thorn hedge,it was nothing but large and beautiful flowers.He went on farther,and in the great hall he saw the whole of the court lying asleep.Then he went on still farther,and at last he opened the door into the little room where the king's daughter was sleeping.
There she lay,so beautiful that he could not turn his eyes away,and he stooped down and gave her a kiss.But as soon as he kissed her,she opened her eyes and awoke and looked at him quite sweetly.

20:七分之三=140/3
0.4：二十分之7=8/7
9比0.6=15

把3/4与7/20通分
二者化为15/20和7/20
那么8/20,9/20,10/20,11/20,12/20,13/20,14/20都是比3/4,比7/20大的分数了,再约一下分,就得到了
2/5,9/20,1/2,11/20,3/5,13/20,7/10这7个数了
其实还有很多,只要把通分的分母变大,想有多少就有多少了

碳水化合物曾经一度被认为只能产生于生物之中.
重点词汇：
compounds of carboon 碳水化合物
living organism 生物

The full mark of this test paper is 100 scores,with 20 of listening test.

1、月里嫦娥舒袖舞
人间玉兔报春来
横批：玉兔赐福
赏析：这个春联写的好,好在：将兔年暗含在对联中,同时写出了人间天上的盛世美景,一片祥和的氛围.
2、卯时一到春入户
兔年来临福满门
横批：兔年吉祥
赏析：这个春联写的一般,一般在：用词是很对仗,但是意思上的对仗欠缺,没有什么意境.
3、金虎归山辞旧去
玉兔下凡迎春来
横批：寅去卯来
赏析：这个春联写的好,好在：一个“金虎”、一个“玉兔”,有种金玉满堂的喜感,加上后面的动词“归山”、“下凡”,整个对联很有气势,对仗在形式和内容上都很工整,是为上品.
4、虎年一去春风暖
兔岁乍来喜气浓
横批：喜迎新春
赏析：这个春联写得好,好在：一去一来间上一个冬季过去,新的春季和喜气具来,横批喜迎新春十分贴切.
5、寅年春锦绣
卯序业辉煌
横批：大展宏图
赏析：这个春联写的不错,不错在：下联“卯序业辉煌”写的极棒,和上联遥相呼应.
6、金虎腾跃风流世
玉兔笑迎锦绣春
横批：盛世欢腾
赏析：这个对联写得好,好在腾跃和笑迎写出了金虎和玉兔的动态之感,给人以欢腾喜庆的感觉.
7、庆玉兔今年奋起
祝金龙明岁腾飞
横批：万事如意
赏析：这个春联写的不错,一个庆奋起,一个祝腾飞,写出了美好的祈愿,十分的吉祥.
8、山中虎啸昌新运
月里兔欢启宏图
横批：迎春接福
赏析：这个春联写的尚可,对仗工整,寓意一般.
9、岁首喜看玉兔跃
耳边犹有金龙吟
横批：欢度春节
赏析：这个春联写的不错,很有寓意,期待来年更好.
10、喜兔年初开春色
继虎岁再展宏图
横批：形势喜人
赏析：这个春联写的好,对仗工整,用词巧妙,“喜”和“继”,“初”和“再”,“开”和“展”都用的比较精准,让人眼睛一亮,赞叹绝妙.

3/20x:18%x=6.5/x
0.15x=6.5/x ×0.18x
0.15x=1.17
x=7.8

设作对了x道题,20x-10*（10-x）=160,30x=260.得不到整数,题目数目必须是整数,所以总分不会出现160

小华每分钟吹一次肥皂泡,每次恰好吹100个.肥皂泡吹出之后,经过一分钟有一半破裂,经过两分钟还有1/20没有破裂,经过两分半钟肥皂泡全部破裂,小华在第21次吹出100个新的肥皂泡的时候,没有破裂的肥皂泡共有（）个?
1、小华每分钟吹一次肥皂泡,每次恰好吹100个.第21次吹出100个新的肥皂泡,共需21分钟
2、经过两分半钟肥皂泡全部破裂,因此18分钟及此前吹出的肥皂泡已经全部破裂.
3、19分钟吹出的100个肥皂泡,已经经过两分钟,还有1/20没有破裂,即5个.
3、20分钟吹出的100个肥皂泡,已经经过一分钟,有一半破裂,没有破裂的有50个.
4、21分钟刚刚吹出了100个肥皂泡.
此时,没有破裂的肥皂泡共有：
5+ 50 + 100 = 155（个）.
或：100× (1+ 1/2+1/20 )=155(个)

We should good good study,day day up!
通过此句子可以说明说话不要用中国式英语,这种恐怕连外国人也听不懂.
如果能让学生纠错,形成互动就更能加深学生印象了.

用裂项法
1/ab=1/1×3=[1-(1/3)]/2
1/(a+2)(b+2）=1/3×5=[(1/3)-(1/5)]/2
1/（a+4)(b+4)=1/5×7=[(1/5)-(1/7)]/2
……
1/（a+100)(b+100)=1/101×103=[(1/101)-(1/103)]/2
相加得
原式=[1-(1/103)]/2=51/103.

自认已经全部改好了：
1.who's→whose
2.the excellent→the most excellent
3.but she work very hard→she works very hard
4.on common→in common
5.a lot talk about→a lot to talk about
6.something happened→something had happened
7.was out→were out
8.while she smelt→when she smelt
9.stopped look→stopped to look
10.find a cloud→found a cloud
11.called 119 immediate→dialed 119 immediately
12.put out fire→put out the fire

箫心玥,
客车每小时行全程的：
1÷8＝1/8
货车每小时行全程的：
1/8×4/5＝1/10
3小时20分两车共行了：
（1/8＋1/10）×3又20/60＝3/4
两地相距：
120÷（1－3/4）＝480（千米）
货车每小时行：
480×1/10＝48（千米）

20
=4又20分之320


一刻永远523

老实说,这不是新闻（最后连个比分也没有）,中文看看也算了,费劲翻译成英文绝对是做无用功.建议你和主编好好谈谈,劝他放弃这个念头.

A：CH3COOH B：CH3CH2OH
C：CH3CHO
C→A：2CH3CHO+O2→2CH3COOH
我尽力啦!

设答对x题,则答错10-x题
3x-2（10-x）=20解得x=8
所以答对8题.

tan(180+45)tan(360*2-60)-4sin(180+30)cos(360-30)
=tan45(-tan60)-4(-sin30)cos30
=-1*√3+4*（1/2）*(√3/2)
=0

设甲速度为3x千米/小时,乙的速度就是4x千米/小时.
甲达目到的地用时：6/3x,乙到达用时:10/4x
甲比乙提前20分,即提前1/3小时.
6/3x+1/3=10/4x
解得：x=3/2
甲的速度=3x=4.5千米/小时
乙的速度=4x=6千米/小时.

1-（1/7）-（1/2）=5/14
是全程的十四分之五

x/2+x/6+x/12+x/20+x/30=5
x(1/2+1/6+1/12+1/20+1/30)=5
x(3/6+1/6+1/12+1/20+1/30)=5
x(4/6+1/12+1/20+1/30)=5
x(8/12+1/12+1/20+1/30)=5
x(3/4+1/20+1/30)=5
x(15/20+1/20+1/30)=5
x(16/20+1/30)=5
x(8/10+1/30)=5
x(24/30+1/30)=5
x(5/6)=5
x=6

I feel lucky that I got to know you. I think I can't find anyone to talk to if i didn't know you.
I participated in English spelling test few years ago, but I had low vocabularies. Therefore, I didn't get any good grade. Now, I hope I could give all my luckiness to you. Fight for it! I'm sure that you'll get good grades, and your teacher will also satisfied.
On this Sunday, I'll attend the ceremony. Now, I'm excited about it- I'm not good at finding the place of the ceremony, hoping that I won't be late.
Are you busy recently? Our teacher assigns lots of homeworks everyday. It totally mess up my plans and i didn't even have enough sleep. Even though its only March, but I already expecting the summer vacation. By that time, I'll get more sleep, and we can talk with each other about everything-happiness and sadness.
I realized I shouldn't get angry at the person who talks behind me, because it just not worth it. Instead of wasting my time to mad at them, I rather consider more about someone that I love. Like you, I always felt extremely happy whenever I wrote a letter to you or read your letters.
Also, I'm going to the library with my friends on this Saturday. However, I feel a little sad. If I can meet you one day, how nice would that be. Do you think this is possible? I think so, do you?
(满意吗?)

大彻大悟 豁然大悟 豁然开朗 茅塞顿开 如梦初醒 等等

21次的有100个
20次的有100/2=50个
19次的有100*1/20=5个
一共有100+50+5=155个

1、
三分之一*12.56*1.2=1.6（m）
2、
（1）5*3=15（cm）
（2）12*3=36（平方厘米）
3、6*4*2.2-6*4*2=4.8（立方分米）
4、15.7/3.14/2=2.5（dm）
2*3.14*2.5*2.5+15.7*15.7=285.74（平方分米）
3.14*2.5*2.5*15.7=308.1125（立方分米）
5、10*10*10=1000（立方厘米）
20-1000/（50*40）=19.5（cm）
6、（1）4的平方*3*三分之一=16（cm）
（2）3/2=1.5（cm） 1.5的平方*3.14*4=28.26（立方厘米）
7、5*5*5=125（立方分米） 125*2.7=337.5（kg）
8、0.25的平方*3.14=1.57（平方米） 25.12/1.57=16（周）
9、40/十五分之八=75（人）
10、990*十一分之五/90=5（小时）
11、30*（1-40%-50%）=3（kg）
12、56/35%=106（kg）
13、14、15、16那么简单自己会写的了.
17、（1）五年级300人,四年级192人.
（2）（300-192）/300*100%=36%
18、（1）45*（1+20%）=54（页）
（2）54/四分之一=216（页）
19、5000千米=500000000cm 设约xcm,列方程得
1：6000000=x：500000000
x=八又三分之一
20、（1）1：5000000
（2）画两个一厘米的线段.标注.
21、不会.
21、设教学楼有x米,列方程得
1.6：2=x：36
x=28.8
22、设.
四分之一x=48%*（1500-x）
x=900
1500-900=600（只） 答：鸡有900只,鸭有600只
23、设.则.
（七分之六x+x）*4=364
x=49
七分之六x=七分之六*49=42（km/h）
24、18-360*18/（360+72）=3（天）
呼呼..终于打完了,你也是六年级的吧,快要考试了,要认真复习哦!

sp杂化是由s轨道和一个p轨道杂化形成两个能量均等的轨道,两个sp杂化轨道对称轴之间的夹角是180º（成一条直线）.两个未参与杂化的p轨道互相垂直,并且都与两个sp杂化轨道对称轴组成的直线垂直.
sp杂化：以乙炔为例,碳原子用一个2s轨道和一个2p轨道进行杂化,形 成两个相等的sp杂化轨道.每个sp杂化轨道包含1/2s轨道成分和1/2p轨道成分,这两个sp杂化轨道的对称轴形成180度的夹角,处于同一直线.
分子杂化类型由取决于的孤对电子对数目和成键电子对数目
对于ABn型分子
孤对电子对数目=（A最外层电子数—B成单电子数×n)÷2
成键电子对数目=n
对于BeCl2,孤对电子对数目=（2—1×2）÷2=0,成键电子对数目=2
二者之和0+2=2,故为sp杂化
对于BF3,孤对电子对数目=（3—1×3）÷2=0,成键电子对数目=3
二者之和为0+3=3,故为sp2杂化
以此类推,4为sp3杂化,5为sp3d杂化,6为sp3d2杂化
等性杂化轨道类型 夹角 分子的空间构型 实例
sp杂化 1080 直线型 BtCl3
sp2杂化 1200 平面三角形 HgCl2
sp3杂化 109028/ 正四面体 CH4、SiH4、NH4+
sp3d2杂化 900及1800 正八面体 SF6
不等性杂化轨道类型（杂化轨道中有孤对电子存在）
不等性sp3杂化 104045/ 三角形 H2O H2S
10705/ 三角棱锥 NH3 PH3

设答错了x道,答对了（12-x）题.
20（12-x）-10x=150240-20x-10x=15030x=90x=3
答：答错了3道.
~一刻永远523为你解答,祝你学习进步~~~~如果你认可我的回答,请及时点击【采纳为满意回答】按钮~~手机提问者在客户端右上角评价点“满意”即可.

二十分之（13 ）= （60 ）分之三十九=0.65=（52 ）除80=（65 ）%

只要发生化学反应就可以,如果生成物有气体或有能量变化导致压强变化的则一定要在密闭容器中进行,如碳酸钙和盐酸
其余如氢氧化钠溶液与硫酸铜溶液敞口容器也可以,因为没气体产生

1km=1000m=10^6cm=10^7mm
1m^2=10000cm^2
1m^3=1000L=1000dm^3=10^6cm^3
1kg=1000g
1h=60min=3600s

1定义,对所有的x,都有f(x+T)=f(x),这种方法一般
2三角函数y=Asin(ax+b)周期为2pi/a
3对于一般函数f(x+a)=-f(x),则周期为2a;f(x+a)=1/f(x),周期为2a等
4通过图像,看图像的重复

I'm so proud of being a member of this school
能成为这个学校一员我很骄傲

（1）数：100 英：85 语：90
（2）甲：40 乙：24 丙：32

硫氢根大于硫根 硫酸氢根大于硫酸根 因为都多一个氢离子 水解电离时水中氢离子都比后者多

答：1小时二十分+3小时四十五分等于五又十二分之一小时

这种题就是问什么设什么!
解 设 错了X道题 则对了10-X道题
可列恒等式 （10-X）*3-2X=20
解得 X=2
哦了 这题我可是帮你解答了

1.当a=0时,偶函数 ,当a≠0时,非奇非偶函数
2.令f'(x)=(x^3+a)/x^2≤0得x≤(a/3)^(1/3),
只需要(－无穷,－2]是（－无穷,(a/3)^(1/3)]的子集
即－2≤(a/3)^(1/3)解得a≥-24

ABCDEF
×3
————
BCDEFA
142857
*3
————
428571
285714×3=857142

定义:函数y=f(x)如存在一个不为零的常数T,使得当x取定义域内的每一个值时,函数f(x+T)=f(x)都成立,就把函数y=f(x)叫周期函数,非零常数T叫函数周期.周期性是"有规律地重复出现",f(x)=f(x+T)则T和整数倍是一个周期

设答对了x道
3x-2(10-x)=20
x=8

Most words used in the English language today were not originally English.These words were borrowed (taken) from other languages.The majority of English words have Latin or Greek origins.When taking t...

五分之二乘百分之六十加上二十分十九乘五分之二加二十分十九乘百分之六十
=2/5*60/100+ 19/20 *2/5+19/20*60/100
=2/5*3/5+ 19/20 *(2/5+3/5)
=6/25+ 19/20
=24/100+ 95/100
=119/100

假设全是20分的,
总面额=20×35=700分=7元
假设不成立.
50分面额的枚数
=（10-7）×100÷（50-20）
=300÷30
=10枚

20元面额枚数
=35-10
=25枚