感激不尽命题甲:四边形ABCD是平行四边形,命题乙;四边形ABCD是正方形,则(A)甲是乙的充分条件不是必须条件(B)甲

YaoXia922022-10-04 11:39:544条回答

感激不尽
命题甲:四边形ABCD是平行四边形,命题乙;四边形ABCD是正方形,则
(A)甲是乙的充分条件不是必须条件
(B)甲是乙的必需条件不是充分条件
(C)甲是乙的充分必须条件;
(D)甲不是乙的充分条件,也不是乙的必须条件
帮我看下应该选哪个

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共4条回复
斯文扫扫地 共回答了14个问题 | 采纳率92.9%
B
1年前
打猎08 共回答了6个问题 | 采纳率
B
1年前
xinyi3216 共回答了155个问题 | 采纳率
充分是指能推出这样的结论,必要是指B是A的条件之一,但不能推论出是A,故
甲是乙的必要条件。但非充分条件。
选项B
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...
1年前
xyct198589 共回答了21个问题 | 采纳率
B
1年前

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4
Only mother love is true love. It gives e_________ everything all his life.
When you are still a baby, mother takes good care of you as much as possible. In your waking hours she always holds you in her arms. When you are ill, she stops her work right now to look after you day and n__________ and forgets about herself. When you are growing up day by day, she feels very happy.
When you are old e__________ to go to school, mother still looks after you all the t_______ . On cold winter days, she always tells you to p_______ on more clothes. She always stands in the wind waiting for you back from school every day. When you hurry to leave home for school with little b_________ . She always feels worried about you at home. She u________ knows about you study and spend much money on your school things. When you do well at school , you will see the brightest s__________ on her face. Mother can do everything for you day after day.
Mother is always ready to give everything she has to her children, not to receive. What true love that is in the w________ ! We will r____________ Mother Love for ever!
1___everybody______ 2_______night___ 3________enough___ 4________time__ 5 ___put_______
6___busy______ 7_____usually_____ 8________smile___ 9_________world_ 10 __remember________
KEYS:4
1. everyone / everybody 2. night 3. enough 4. time 5. put
6. breakfast 7. usually 8. smile 9. world 10.remember
5
Seumas Mcsporran is a very b____ man. He is 60 years old and he has thirteen jobs. He is a postman , a policeman ,a fireman , a taxi driver , a school-bus driver , a boatman ,an ambulance man , an accountant , a petrol attendant , a barman , and an undertaker .Also , he and his wife , Margaret , have a shop and a small hotel.Seumas l_____ and works on the island of Gigha in the west of Scotland. Only 120 people live on Gigha but in s_____ 150 tourists come by b_____ every day.Every weekday Seumas gets up at six and makes b_____ for the hotel guests. At eight he drives the island’s children to s_____ . At nine he collects the post from the boat and delivers it to all the houses on the island. He also delivers the beer to the island’s only pub. Then he helps Margaret in the s_____ .He says:“Margaret likes being busy,too.We n_____ have holidays and we don’t like w_____ television. In the evening Margaret makes supper and I do the accounts. At ten we have a glass of wine and then we go to bed. P_____ our life isn’t very exciting, but we like it.”
1.______busy____ 2 _lives__________ 3 _______search_____ 4 __________bus__ 5 ______breakfast_____
6.____school______ 7 _____sea______ 8 ______never______ 9 _________watch___ 10 ___Perhaps________
KEYS:5
1. busy 2. lives 3. summer 4. boat 5. breakfast 6. school 7. shop 8. never 9. watching 10. Perhaps
6
Tim spent in a bookshop can be enjoyable . If you go to a good s________ , no assistant will come near to you and say , “Can I h______ you ?” You needn’t buy a________ you don’t want . You may try to find out where the book you want is . But if you w_______ , the assistant will lead you there and then he will go away . It seems that he is not interested i_____ selling any books at all .
There is a story which t_______ us about a good shop . A medical student found a very useful book in a shop , but it is too expensive for him to b______ . He couldn’t get it from the library , e_______ . So every afternoon he went there to r______ a little at a time . One day , however , he couldn’t find the book from its usual place and was leaving when he saw an assistant signing to him . To his s________ , the assistant pointed to the book in a corner , “I put it there so as not to be sold out .”said the assistant . Then he let the student go on with his reading .
KEYS:6
store , help , anything , want , in ,
tells , buy , either , read , surprise .
英语翻译哪能买到傅东华翻译的?一个同学要用的~还有,我想知道这本书的书号和出版社~如果谁知道感激不尽啦!3Q~
sgerhehw1年前1
love_hengshui 共回答了24个问题 | 采纳率87.5%
淘宝网 我自己去找了`
英语翻译能请你在我休假的两周(12-Nov to 23-Nov )里帮我给北京办公室里的同事们订机票吗?如果可以感激不尽
英语翻译
能请你在我休假的两周(12-Nov to 23-Nov )里帮我给北京办公室里的同事们订机票吗?如果可以感激不尽!
朵芮亚001年前3
1年No5季 共回答了14个问题 | 采纳率78.6%
would you mind helping me book tickets for my colleagues during my two-week off(12-Nov to 23-Nov I would be very grateful if you can help me with this matter!
五年级上英语UNIT2测试题请诸位帮忙找找五年级上册英语第二单元\第三单元测试卷,感激不尽!
jumpin1年前1
保持老土 共回答了14个问题 | 采纳率100%
拜托出题了
……
能解多少是多少,今晚就要,感激不尽啊
能解多少是多少,今晚就要,感激不尽啊
1.I do my homework after dinner for two hours.【改为同义句】
( )takes me two hours( )( )my home after dinner.
2.吃很多蔬菜是健康的【翻译句子】
( )is healthy( )( )many vegetables.
3.Then he goes to a bus station by bike.【改写句子】
卡巴斯基21年前1
梦00 共回答了12个问题 | 采纳率91.7%
1 It ,to do
2 It ,to eat
3 Then he ride a /his bike to a bus station .
求一篇英语短文,感激不尽,短文主题是,(你是否同意,我不能“没有什么值得的,而是“我会试着“有可能实现奇迹.”这个说法?
求一篇英语短文,感激不尽,
短文主题是,(你是否同意,我不能“没有什么值得的,而是“我会试着“有可能实现奇迹.”这个说法?)请告诉我具体该怎样用英文表达观点
yinjunbobo1年前1
兔哞哞 共回答了22个问题 | 采纳率81.8%
Do you agree with "there is no motivation left for me to do it" or "I will try,miracle might happen"?
(introduction)
People are who they are because of their emotions.One of which is desperation,and the other is despair.When people are desperate,they will try whatever is there and hope for the best,while when people are in despair,they try nothing.The two statements in question are clear questions that one would ask in each emotional stage.I,however,do not agree with the saying "there is no motivation left for me to do it."
(argument 1)
Firstly,the prime motivation should always be for ourselves.We are doing it because it would make our life better.I suppose the condition is as so,otherwise the question in title would have no meaning.Thus,when we are doing it for ourselves,we always have the reason.
(argument 2)
Secondly,one never know what might happen.Instead of wait and lose,why not try and lose?In the end,when one looks back,one would say to himself:"I tried".Rather than regret:"I could have tried."
(argument 3)
Thirdly,miracles do happen.Although scientifically speaking,miracles are just fruits of hard work,but one never know whether his work will be successful.So one should always try first,surprises happen everyday.The god of luckiness doesn't mind place his hand on you when he have placed his hand on many others already.
(conclusion)
People are weak at times.Thus,the holes in humanity is revealed.The only way to cover up that hole,is to use courage.When the Allies were losing in World War Two,people were desperate.But what kept them moving?It is courage.The courage to believe.To believe that we will win one day,and the bad shall never conquor us.
英语翻译本人刚刚从事外贸,请求高手帮翻译一下合同.感激不尽.有意者加Q聊.271849342 First Class I
英语翻译
本人刚刚从事外贸,请求高手帮翻译一下合同.感激不尽.有意者加Q聊.271849342 First Class Insurance Company
Laboratory Services International BV
Geyssendorfferweg 54
3088 GK Rotterdam
The Netherlands
OR
A.H.Knight International Ltd.
Eccleston Grange
Prescot Road,St.Helens
Merseyside WA10 3BQ,England
OR
Alex Stewart (Assayers) Ltd.
Caddick Road
Knowsley Industrial Estate
Knowsley,Merseyside
L34 9ER England
10.Suspension of Quotations:
Should any quotation referred to in this contract cease to be published or cease to be representative,Buyer and Seller shall negotiate in good faith to establish a mutually acceptable pricing method.
11.Title and Risk
Title shall pass from Seller to Buyer upon Seller's receipt of the provisional payment.Risk shall pass from Seller to Buyer upon delivery of material over ships rail at loading port.
12.Failure to Accept Delivery
If Buyer fails to accept delivery more than 10 days after the agreed upon dates for any reason except the documents’ arrival is later than the vessel’s arrival and other than force majeure,Seller shall be entitled to:a) sell to other Buyers quantities of Leadore which Buyer is or expects to be unable to accept and Buyer shall be liable to Seller for any cost,expense or loss arising out of such sales; or b) agreed by Buyer’s confirmation then extend the term of this contract and charge Buyer storage charges as per official Chinese warehouse tariffs per metric ton/month,said storage charges being due and payable in advance on the first day of each month during which a delay shall continue.A delay for any part of a month shall entitle Seller to storage charges for the entire month.Buyer shall give Seller written notice immediately upon anticipating a failure to accept delivery.
First Class Insurance Company
Such insurance shall be in effect from the passing of risk at the port of loading through to Buyers’ designated smelter yard.Claims shall be payable in U.S.dollars in the country of Buyer’s domicile.
Notwithstanding the above,it is Buyer's responsibility for properly filing the insurance claim in accordance with the terms and conditions of insurer's coverage.Seller agrees that it will co-operate and assist the Buyer to the best of its ability in proceeding settlement of any loss or damage with an insurance company.
14.Ship Lost and Damage Clause
14.1 In the event that the complete cargo is lost or no part thereof shall arrive in good condition,final payment shall be made in accordance with the terms and conditions contained herein.Cargo shall be deemed to have arrived after B/L date.B/L weight,along with moisture and assays determined at the time of loading,will be on the basis for final settlement.
woody101年前1
zhuangyan_1982 共回答了16个问题 | 采纳率100%
这些都是一些标准问题,查一些资料,都是说常用的.外贸书籍上都有,可以去查查看看,不难的!只不过你这太多了.耽误时间!自己努力吧.
能借多少是多少,今晚就要,感激不尽
能借多少是多少,今晚就要,感激不尽
1.已知实数abc满足a+b+c=-7,则当x=-1,多项式ax【x的5次方】+bx³+cx-1的值是( )
2.下列各数中,最小的实数是( )
A.-√3 B.-2 C.0 D.1
3.下列说法中,正确的是( )
A.3是单项式 B.-3x/2的系数是-3 C.2x²是三次二项式 D.1/2xy²z的次数是2
4.已知下列7个实数:0,π,-√2,2/3,-1.1,³√8,√17.
1.将它们分成有理数和无理数两组;
2.计算其中的有理数之和减去-√1/9【负根号九分之一】与-1/10【负十分之一】的和;
3.将7个实数按从小到大的顺序排列,用“<”号连接
dywqq1231年前3
cmd3389 共回答了24个问题 | 采纳率87.5%
6
B
A
1)有理数:0,2/3,-1.1,³√8.无理数:π,-√2,√17
2) 0+2/3+(-1.1)-(-√1/9-1/10)=0
3) -√2<-1.1<0<2/3<³√8<π<√17
急求英语翻译:免拨直通电话,便民服务台,钱款请当面点清.感激不尽!
disywang1年前2
scxuhaitao 共回答了20个问题 | 采纳率85%
Free direct phone calls ,Convenience service counter,Please Check your money on the Spot
数学题,解方程;求求大家~~快点吧!感激不尽
数学题,解方程;求求大家~~快点吧!感激不尽
南京长江大桥的铁路桥长9772米,公路桥长4589米,他的铁路桥比武汉长江铁路桥的5倍多197米,公路桥比武汉长江大桥的3倍少421米. (1)武汉长江大桥铁路桥长多少米? {2}武汉长江大桥公路桥长多少米?
我爱ii子1年前1
beishang 共回答了19个问题 | 采纳率84.2%
设武汉长江大桥铁路桥长X米,由题可得:
5X+197=9772
5X=9575
X=1915
设武汉长江大桥公路桥长Y米,由题可得:
3Y-421=4589
3Y=5010
Y=1670
答:(1)武汉长江大桥铁路桥长1975米,{2}武汉长江大桥公路桥长1670米.
哪位高手帮解一道高中物理题,有讲解最好,在下感激不尽.
哪位高手帮解一道高中物理题,有讲解最好,在下感激不尽.
已知O,A,B,C为同一直线的四个点,AB间距离为L1,BC间距离为L2,一物体自O点由静止出发,沿此直线做匀加速运动,依次经过A,B,C三点,已知物体通过AB段与BC段所用时间相同,求O与A的距离.
llbeyondll1年前3
西门野孩子 共回答了15个问题 | 采纳率93.3%
设A,B,C速度分别为Va,Vb,Vc,物体通过AB段与BC段所用时间相同,都设为t
因为AB平均速度=位移/时间=(Va+Vb)/2=L1/t (1)
BC平均速度=位移/时间=(Vb+Vc)/2=L2/t (2)
AC平均速度=位移/时间=(Va+Vc)/2=(L1+L2)/2t (3)
(1)-(2),得到(Va-Vc)/2=(L1-L2)/t (4)
(4)+(3),得到Va=(3L1-L2)/2t,Vb=(L1+L2)/2t
因为Vb^2-Va^2=2aL1
a=(Vb^2-Va^2)/2L1=[((L1^2+2L1L2+L2^2)/4t^2-(9L1^2-6L1L2+L2^2)/4t^2]/2L1
=(8L1L2-8L1^2)/8t^2L1=(L2-L1)/t^2
因为O点物体静止
所以OA=Va^2/2a=[(3L1-L2)^2/4t^2]/[2(L1-L2)/t^2]
=(3L1-L2)^2/8(L1-L2)
飞毫列锦绣,拂素起龙游。提示,素。动物猜谜,有谁知道是什么动物麻烦告诉我下,感激不尽,我真的很急用,求求大家尽量帮忙??
飞毫列锦绣,拂素起龙游。提示,素。动物猜谜,有谁知道是什么动物麻烦告诉我下,感激不尽,我真的很急用,求求大家尽量帮忙???
catyx211年前5
zhenshiqiao 共回答了3个问题 | 采纳率
鱼亲,对我的回答满意的话,就给个好评吧。如果还有不清楚的地方,可以跟我继续交流哦。为啥?这出自岑文本的奉述飞白书势。你没学过?哪有为什么,你读一读全诗就知道了。锦绣是金鱼我知道,到你觉得老师会出这么简单的题?你如果不想找骂就滚好吧,比我老师还凶,我试试不就行了么...
用一段话描写水仙花~要从它的茎、叶、花写,还要了解它的颜色样子得到能够,只要150字这样就可以了,帮个忙拉,小女感激不尽
用一段话描写水仙花~
要从它的茎、叶、花写,还要了解它的颜色
样子得到能够,只要150字这样就可以了,帮个忙拉,小女感激不尽~
二分之四1年前1
goldruler 共回答了21个问题 | 采纳率85.7%
不好意思啊.
不过我可以给你提供几个成语#17..
希望可以给你带来帮助!
冰清玉洁、洁白如玉、香清色雅、冰雕玉琢……
如何把雄心壮志概括成两个字,求学霸指点,感激不尽!
狂人20061年前8
zzz0909 共回答了1个问题 | 采纳率100%
志志向
2011寒假新时空 上 所有作文的题目 有买的写下 感激不尽
2011寒假新时空 上 所有作文的题目 有买的写下 感激不尽
就是作业里的几篇作文题目 急啊··························································
作业本里3篇作文到底写什么
老子还要你们想?
全一点
人鬼神魔_uu1年前3
aieshaft 共回答了16个问题 | 采纳率93.8%
只有三篇作文
1、请以“告别”为题,600字记叙性文章.
2、请你以“感谢——”为题,600字.
3、“黑板上的记忆”,依旧是600字.
好了.楼主,就只有三篇作文.给我分吧.
英语造句:If I were the god(如果我是神)……(6句) 哪位大侠帮个忙 感激不尽
英语造句:If I were the god(如果我是神)……(6句) 哪位大侠帮个忙 感激不尽
最好带上汉语
Adaminstrator1年前2
小童子 共回答了11个问题 | 采纳率100%
If I were God I would do all the things I'd like to do.
I would never go to work or pay attention to some jerk
I would jump from every mountain.
I would sail the seven seas
I would fly up in the sky
I would see all the things I never see
I would always be with you and make all your dreams come true
I would fill your days with laughter
I would live a million years
We'd be happy ever after
They would never see our tears
Guess how wonderful it would be
how wonderful it would be
我有些数学题不怎么会,各位大侠们,会的帮帮我哈~~小女一定感激不尽.几日后病好好报答~ 第一题 :21-4/3(我的意思
我有些数学题不怎么会,各位大侠们,会的帮帮我哈~~小女一定感激不尽.几日后病好好报答~ 第一题 :21-4/3(我的意思是三分之四)- 4/15 - 4/35 - 4/63 - 4/99 - 4/143 - 4/195 - 4/255=?
第二题 :19/97+1919/9797分数线(前面一组数的是分子,后面一组数是分母)19191919/97979797=?
第三题 :在节目游园会上,第一位入场的取1件礼物,再另取剩下的十分之一,第二位入场的取2件礼物,再另取剩下的十分之一,第三位入场的取1件礼物,再另取剩下的十分之一,……直到准备的礼物全部取完.结果发现取到礼物的人拿的礼物数都相等,里礼物的总数为——.得到礼物的人数为——.


就这几道题了.
zwk19877251年前1
6pha 共回答了16个问题 | 采纳率87.5%
第一题 :21-4/3-4/15-4/35-4/63-4/99-4/143-4/195-4/255
=21-4/(1*3)-4/(3*5)-4/(5*7)-4/(7*9)-4/(9*11)-4/(11*13)-4/(13*15)-4/(15*17)
=21-(2/1-2/3)-(2/3-2/5)-(2/5-2/7)-(2/7-2/9)-(2/9-2/11)-(2/11-2/13)-(2/13-2/15)-(2/15-2/17)
=21-2/1+2/3-2/3+2/5-2/5+2/7-2/7+2/9-2/9+2/11-2/11+2/13-2/13+2/15-2/15+2/17
=21-2+2/17=19又2/17
第二题:设19=a,97=b
原式等于(a/b+101a/101b)/(1010101a/1010101b)=(a/b+a/b)/(a/b)=2
第三题 :设礼物数为n
第一位入场的取的1+0.1*(n-1),剩余n-1-0.1*(n-1)=0.9*(n-1)
第二位入场的取的2+0.1*(0.9*(n-1)-2)
1+0.1*(n-1)=2+0.1*(0.9*(n-1)-2)
10+n-1=20+0.9*(n-1)-2
n=9+0.9n-0.9
0.1n=8.1
n=81
因此第一位入场的取的1+0.1*(n-1)=1+0.1*(81-1)=1+0.1*80=1+8=9
因此得到礼物的人数为81/9=9人,礼物的总数为81件
用15个成语编一个小故事,感激不尽
guyanwei1年前1
xu07015388 共回答了27个问题 | 采纳率81.5%
老师上课要我们用:……………………(乱写十五个成语)造句
读书笔记:……………………(乱写十五个成语)
高一英语语法总结被动语态、常见情态动词用法、表语从句、主语从句、同位语从句用法要点和解题技巧英语比较差,感激不尽!
jameszzj1年前1
昨日红颜 共回答了15个问题 | 采纳率100%
语法讲一千遍过后的结果往往不是学生更加明白而是更加的糊涂.
语法的学习首先要知道什么时候用这个语法项目以及在什么地方用这个语法项目.
时态往往和说话人的主观表达意图有很大的关系,如进行时会让你的描述生动形象,完成时富含深层次的含义甚至于感情,一般式往往只是毫无目的的简单直陈.
语态其实在汉语中也一样存在,记得小学时候的被动句式和把字句式吗?那就是被动语态和主动语态.
主语从句、宾语从句、表语从句和同位语从句都是名词性从句,说得简单点,这些从句都相当于一个名词,可以当做名词来进行使用.但是所有的从句,不管是定语从句,状语从句还是名词性从句,他们的前面都会有一个连接词,如which, what, when, where,how等等,连接词后面紧跟的往往是一个主谓结构(俗称陈述句语序).
语法题解题的主要技巧还是要把每个题目当做阅读理解来做,要体会说话人的表达意图,了解其感情色彩,这样才会选择恰当的表达方式.
内容太多,真要讲清楚恐怕至少也得万把字,只能如此了.
几个数学麻烦题,有点难算,路过的好人们帮我看一下哈~感激不尽
几个数学麻烦题,有点难算,路过的好人们帮我看一下哈~感激不尽
下列说法正确的是( )
A 零的平方根和立方根是零
B 1的平方根与立方根都的关于它本身
若一个数的平方根是正负八,则这个数的立方根是( )
A 四 B 正负四 C 二 D正负二
这个较为有难度听好了:
如果一个球的体积为原来的8倍,那么它的半径为原来的多少倍?如果一个球的体积变为原来的27倍,那么它的半径变为原来的多少倍?如果球的体积变为原来的1000倍呢?变为原来的N倍呢?
(球的体积公式V=四分之三 × π × 半径的立方 )
那啥……我弄错了,第二题是“等于”不是“关于”哈哈,不过回答的那位同志,我的答案是B B 刚好都相反呢……
jerry20461年前1
waco210 共回答了22个问题 | 采纳率81.8%
下列说法正确的是(A)
A 零的平方根和立方根是零
B 1的平方根与立方根都的关于它本身
若一个数的平方根是正负八,则这个数的立方根是(A)
A 四 B 正负四 C 二 D正负二
这个较为有难度听好了:
如果一个球的体积为原来的8倍,那么它的半径为原来的多少倍?如果一个球的体积变为原来的27倍,那么它的半径变为原来的多少倍?如果球的体积变为原来的1000倍呢?变为原来的N倍呢?
答:如果一个球的体积为原来的8倍,那么它的半径为原来的2倍,如果一个球的体积变为原来的27倍,那么它的半径变为原来的3倍,如果球的体积变为原来的1000倍呢,那么它的半径变为原来的10倍.
帮忙写篇英语作文,感激不尽啊英语中有一句谚语"A friend in need is a friend indeed''
帮忙写篇英语作文,感激不尽啊
英语中有一句谚语"A friend in need is a friend indeed'' 你班展开了以"交友之道"为主题的英语演讲比赛,请以此为题并根据下面的提示写一篇120词左右的演讲稿.开头已给出.
要点1.对人要友善,微笑吸引人;
2.要善解人意,设身处地地为别人着想;
3.关心别人要胜过关心自己;
4.不要吵架,遇事要商量;
5.不要相信那些危急时刻背离朋友的人
6.根据你自己对交友之道的理解,进行适当的补充,发表自己的看法.
How to make friends
Everyone needs friends,so how to make real friends is very important to everyone.
.
kwhs3271年前1
空气回音 共回答了18个问题 | 采纳率100%
how to make friends
everyone needs friends,so how to make real friends is very important to everyone.a good friend can make you a better person,a bad friend can destroy you in many different ways.to have a friend you may like,first you should be a good friend to others.so what's a 5 star friend?in my opinion,a good friend is kink to others ,he should have smile on his face anytime,he should be considerative,to think about what others think,and he should care about others more than himself.when good friends quarrel,they should calm down to think carefully about their own mistakes.some friends may destroy you,they are not real friends,that is,a friend in need is a friend indeed.
thanks!
几道高中圆与直线位置关系的题目~感激不尽!TT___TT 一、已知圆C:x+y+2x-4y+3=0 (1)若不过原点的直
几道高中圆与直线位置关系的题目~感激不尽!TT___TT 一、已知圆C:x+y+2x-4y+3=0 (1)若不过原点的直线L与圆C相切,且在X轴,y轴上的截距相等 求直线L的方程 (2)从圆C外一点P(x,y)向圆引一条切线 切点为M,O为坐标原点,且有|PM|=|PO|,求点P的轨迹方程 二、设圆上的点A(2,3)关于直线x+2y=0的对称点仍在圆上 且与直线x-y+1=0相交的弦长为2倍根号2,求圆的方程 三、已知m属于R,直线L:mx-(m+1)y=4m和 圆C:x+y-8x+4y+16=0 求直线L斜率的取值范围
jz9111年前1
heart277 共回答了15个问题 | 采纳率80%
1)x+y+2x-4y+3=0,∴(x+1)+(y-2)=2 直线L不过原点,且在xy轴上截距相等,则L斜率为-1 设L:y=-x+t,即x+y-t=0 L与圆相切,则圆心(-1,2)到直线的距离为半径√2 ∴|-1+2-t|/√(1+1)=√2 ∴|t-1|=2,t-1=2或-2 ∴t=3或-1,即L:y=-x+3或y=-x-1 ②设P(x,y),则|PO|=x+y,P到C圆心距离平方为(x+1)+(y-2) ∴|PM|=(x+1)+(y-2)-(√2)=x+y+2x-4y+3=0 ∵|PO|=|PM|,即|PO|=|PM| ∴x+y=x+y+2x-4y+3 ∴2x-4y+3=0,即P轨迹为2x-4y+3=0 2)由题意 圆心在x+2y=0上,设圆心(-2t,t) ∴半径平方=(-2t-2)+(t-3)=5t+2t+13 圆方程为 (x+2t)+(y-t)=5t+2t+13 圆心到直线x-y+1=0距离为 |-2t-t+1|/√(1+1)=|3t-1|/√2 由垂径定理,弦长为2√[5t+2t+13-(|3t-1|/√2)]=2√2 ∴5t+2t+13-(3t-1)/2=2 ∴t+10t+21=(t+3)(t+7)=0 ∴t=-3或t=-7 圆为(x-6)+(y+3)=52,或(x-14)+(y+7)=244 3)条件不明确,圆和直线怎么样没说明
高一短文改错一篇有着10处错误的短文,哪位大大能帮忙解决下的,感激不尽啊!In a Sunday morning,i m
高一短文改错
一篇有着10处错误的短文,哪位大大能帮忙解决下的,感激不尽啊!In a Sunday morning,i met a foreigner in a shop.He wanted to buy something,but he couldn't understand Chinese.So he was very anxious.Looking this,I went up to him and asked him that he wanted to buy.He said he wanted to buy a camera.So i asked the assistant the prices of all the camera in the shop.then I told the foreigner the prices and he chose the camera he liked.As result,he was very thankful to me for my kind help,but he praised me for my good English.This was the first time that i talked to a foreign friend in English and helped him.I was great encouraged.I made up my minds to learn English better.
songyuww101年前1
乐乐呀 共回答了22个问题 | 采纳率90.9%
In (On) a Sunday morning,i met a foreigner in a shop.He wanted to buy something,but he couldn't understand Chinese.So he was very anxious.Looking this,I went(came) up to him and asked him that(what) he wanted to buy.He said he wanted to buy a camera.So i(I) asked the assistant the prices of all the camera(cameras) in the shop.then I told the foreigner the prices and he chose the camera he liked.As (加上一个a)result,he was very thankful to me for my kind help,but(and) he praised me for my good English.This(It) was the first time that i talked to a foreign friend in English and helped him.I was great encouraged.I made up my minds(mind) to learn English better.通常会有一处是正确的,没有错误
小女子感激不尽!《高等数学》(上)试题班级 学号 姓名 一 二 三 四 五 总成绩一、(函数)你能体会到指数增长是怎样的
小女子感激不尽!
《高等数学》(上)试题
班级 学号 姓名
一 二 三 四 五 总成绩
一、(函数)你能体会到指数增长是怎样的情形吗?例如,将随便一张纸进行对折,问50次后(仅是理想实验,不考虑技术细节)折出的纸的厚度?
二、(导数)导数 可不可以是负值?你能否举出实际例子?
三、(导数的应用)极大值区别于最大值,对这种区别你能用一句成语或俗语来说明吗?
四、(定积分)假设c(t)***的房间取暖每天所需要的花费,它的计算单位:元/天;时间t以天为计算单位,t=0对应于2008年1月1日,的意思.
五、(求不定积分) 三种积分法(直接积分法、换元积分法、分部积分法)在求积分之外有什么应用.在数学之外有什么启示、作用.(提示:例如我们要买一件贵重商品,与售货员谈优惠价,结果有限,因为授权有限,通常需要“换员”,找他们的经理、老总谈,才可能有好结果.)
注:不能有雷同卷,否则都以零分计.
一人品二技术1年前1
zhenzi1000 共回答了10个问题 | 采纳率100%
f'(x0)
当电源和灯 还有电压表串联在一起 为什么测得是电源电压 感激不尽
ss65614321年前3
feilin7758 共回答了19个问题 | 采纳率84.2%
确切的说应该是近似于电源电压.不过对初中物理而言,就是电源电压.
因为电压表的电阻远远大于灯的电阻,所以把几乎所有的电源电压都占用了,所以测定的值近似于电源电压.
一道数学题,欢迎各位解答谢谢各位帮忙,小弟感激不尽!希望大家给我最简便的答案(要细节过程)A,B两数只有质因数3,5.
一道数学题,欢迎各位解答
谢谢各位帮忙,小弟感激不尽!希望大家给我最简便的答案(要细节过程)
A,B两数只有质因数3,5. A,B的最大公约数是75. 已知A有12个约数,B有10个约数.求A,B两数之和.
zengjuan00251年前3
晒晒小米粒 共回答了17个问题 | 采纳率94.1%
75=3*5^2
AB只有质因数3,5,且都至少有2个因数5
B有10个约数
10=2*5
=(1+1)(1+4)
B=3*5^4=1875
B含有4个因数5,所以A最多只能有2个因数5
A有12个约数
12=2*6
=(1+1)*(1+5)
12=3*4
=(1+2)*(1+3)
所以A=3^3*5^2=675
A+B=1875+675=2550
高数 微积分 希望正确率 还有最好有过程  白纸黑字写纸上 感激不尽
高数 微积分

希望正确率 还有最好有过程 白纸黑字写纸上 感激不尽
如烟缈缈1年前0
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感激不尽
一个长为L,重为G的均匀玻璃容器,其中插一截面积为S,质量忽略不计的轻质活塞,在管中封闭了一定量的空气,将活塞悬挂于O点,静止时空气长度为H,已知大气压为PO,则至少需加多少的外力才能将玻璃管竖直向下拉离活塞?
xioa与小卡通1年前1
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速求人答,感激不尽!3.什么是“香蕉球”?为什么球的运动会变弯?4.飞机是怎么起飞的?飞机起飞前为什么要在跑道上快速运动
速求人答,感激不尽!
3.什么是“香蕉球”?为什么球的运动会变弯?
4.飞机是怎么起飞的?飞机起飞前为什么要在跑道上快速运动一段距离?飞机是顺风容易起飞还是逆风容易起飞?
板凳小子0071年前2
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1.香蕉球又称弧线球.会变弯是因为空气在一个表面水平流动时,气压将降低,比如你在下嘴唇上贴一个纸条,然后向前吹气,纸条就会向上抬起来,这正是因为上方因空气流动使气压降低,纸条受力使然.弧线球发球时给了其一个侧向力使其旋转,这样球在运动时垂直于运动方向的两个面上的空气的相对速度就不一样了,使得球受到一个力的作用发生旋转.
2.机翼上方空气运动的速度大于机翼下方,机身获得一个向上的力,就飞起来了.快速运动就是为了获得足够的力.逆风
寂寞是被沙漠包围的胡杨,置身荒凉却坚韧顽强.(句子彷写)3句,感激不尽
AVnn1年前1
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孤单是被海洋环绕的孤岛,身处浩瀚却坚强刚毅
关于山水风景的作文急用啊,知道的帮帮忙说下,感激不尽山水风景,景色作文都可以
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人们都说:”桂林山水甲天下.“我们乘着木船荡漾在漓江上,来观赏桂林的山水.我看见过波澜壮阔的大海,玩赏过水平如镜的西湖,却从没看见过漓江这样的水.漓江的水真静啊,静得让你感觉不到它在流动;漓江的水真清啊,清得...