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直线X+Y-1=0与椭圆交于A,B两点,且AB=2倍根号2,AB的中点与椭圆中心的连线的斜率为2分之根号2,求椭圆的方程

2023-07-07 12:15:19
共2条回复
CarieVinne

x^2/(1+3sprt2/8)+y^2/(3+4sprt2/2)=1

首先根据题目列出两个直线方程:x+y-1=0 ,y=(2sprt2)x.解出直线AB的中点坐标.然后设椭圆方程为x^2/a^2+y^2/b^2=1.这里先不用考虑椭圆焦点到底在哪个轴上.然后设A(x1,y1) B(x2,y2).用点差法,得到 -(y2-y1)/(x2-x1)=(x1+x2)b^2/a^2(y1+y2) 因为知道AB中点坐标和斜率,所以易得(2sprt2)a^2=b^2所以知道方程焦点在Y轴上.再把AB方程带到设好的椭圆方程中,得到关于X ,a的方程(2sprt2)x^2+x^2-2x+1-(2sprt2)a^2=0 所以x1*x2=(1-2sprt2)a^2/1+2sprt2

因为AB长的方为8,而AB斜率为-1所以(x1-x2)^2=4

易得a^2 和b^2了...

P.S方法每问题,数不太好,不知道算对没...

点差法:就是用两个方程相减,得到关于x1,y1,x2,y2的方程,y2-y1/x2-x1是AB斜率.x1+x2,y2+y1是中点坐标的两倍...

LuckySXyd

x^/(5/2)+y^/(5/2)=1

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2023-07-07 04:08:291

我想通过matlab得一个q=()p的函数,但是用solve怎么也弄不出来,要怎么才能弄出来。详情如下?

题主给出的代码,为什么用solve函数求不出来?由于给出的方程比较复杂,用solve函数求解,得到是无解,所以应改用vpasolve函数求解。具体实现方法如下:1、由于vpasolve函数不适应求解数组形式的数据,所以只能逐个求解。2、应使用for循环语句来完成求解。即for i=1:8S=vpasolve(eval(eq(i))) %eq为具体的表达式end3、实现代码:syms q%assume(q>0);b = tand(70);t = (2*3068)/(2*0.01256*0.00351);d = sqrt(13)*t-(2/3)*t*b;p = (-20000000:20000000:120000000);a = ((3*q-4*d*b+sqrt(9*(q^2)-24*d*b*q-24*(b^2).*p*q-16*(b^2)*(q^2)))/(4*(b^2)));r = (sqrt((2/(3*q)).*(p-a)));eq=sqrt(((p-a).^2)+(r.^2)*(q.^2))+r.*(d+a.*b);for i=1:length(r)S=vpasolve(eval(eq(i)))end4、运行上述代码,可以得到如下结果。
2023-07-07 04:08:361

c语言打完代码不能编译了,编译键按不了 软件没死

你的软件是怎么样的
2023-07-07 04:08:453

七年级英语作文

  在生活、工作和学习中,大家对作文都不陌生吧,写作文是培养人们的观察力、联想力、想象力、思考力和记忆力的重要手段。那么,怎么去写作文呢?下面是我收集整理的七年级英语作文8篇,欢迎大家借鉴与参考,希望对大家有所帮助。 七年级英语作文 篇1   It was a sunny Sunday,my father and I went on an excursion.We took a bus and walked along the river.There"s really a beautiful place!We walked beneath the deep bule sky and breathed the fresh air.And we climbed up the mountain,admired the beautiful sunlight brighten the land.   At noon,my father and I went to a restaurant which is my favourite and had a good lunch.We were so tired that we aet a lot.After a big meal,we went home by bus.The surroundings were beautiful,but I fell asleep after I got on the bus.What"s pity!   This is a happy and funny Sunday. 七年级英语作文 篇2   Taking care of our environment is our duty.But how we can do to make our environment more beautiful? At first,we must make ourselves clean.For example,we must wash our clothes when they are dirty.We should not litter waste things about,and draw on the wall.We mustn't spit in public or cut down trees. We should plant more trees around our nEighbourhood.We should pick the rubbish up and throw them into the dustbin when we see them. We must make our world more and more beautiful,don't you think so? 七年级英语作文 篇3   My Friend Sally is my best friend. She is a girl. Both of us are good at English, so we often talk in English in our spare time. After school, we often do homework together. When we are playing, she runs so fast that I cannot catch up with her. She is an excellent student. She likes pop and classical music. Her dream is to become a teacher. I love my friend Sally. 七年级英语作文 篇4   It was Mother"s Day.Sun Zheng thought he should do something for his mother.He decided to help his mother do some housework.After school he went to a shop to buy some food on his way home.   When he got home, he did his best to cook some nice food,though he couldn"t do the cooking well. Thenhe cleaned the room. He felt very tired, but he was very happy.   When his father and his mother came back and saw the clean rooms and dishes which weren"t so nice, they were very happy。They had their supper together. His mother said, "Thank you,my child!" 七年级英语作文 篇5   I"m a tall and lively boy. I like playing basketball very much because it"s interesting. I like NBA, too. There are many famous stars in it.   Such as Alan, Iveson, Tim, Donken, Jordan, Kobe, O"Neal and so on. Yao Ming is in the NBA, too. He"s Chinese.   He plays basketball well. He"s a center forward. He"s our pride.   All the ball stars can jump, shoot and pour in the basket. So each game of the NBA is wonderful. Sometimes the players can perform miracles, I think.   This year"s champion is Spur Team. It"s one of the strongest contenders.   I like NBA. I love basketball. 七年级英语作文 篇6   1. My Friend(我的朋友)   I have a good friend. Her name is May. She is 12 years old.Her telephone number is 87634966 Her birthday is March 5th. She is good at English and Chiese.She often plays the piano. She likes reading books and listening to the music. Her hobbies are reading and listening to music. She is a nice girl. We often help each other. We are good friends.   2.假设你是李枚,下面的照片是你的全家福,请你写一篇文章介绍你的家庭。Hello,everyone!I"m LiMei.Look! This is my family photo. This is my grandmother. She is 58. This is my father. He is a teacher. He is 36. and my mother is 36, too. Who"s that boyOh, he is my brother. He is 13 and I am 12. My brother and I are students.   3.假设这是TOM的房间,请你用80词左右介绍他的房间。   Look! This is Tom"s room. His photos are on the wall. His T-shirt is on the bed. His baseball bat is behind the dresser. The keys are in the drawer. The computer is on the desk. Where is Tom"s baseballOh, It"s under the bed. What is on the floorThey are Tom"s shoes, socks and computer games. What do you think of Tom"s room   4.写一篇文章介绍你的朋友JIM所拥有的体育器材和他喜欢的体育运动。   Jim has a great sports collection. He has 10 basketballs, 4 footballs,2 ping-pong balls, 15volleyballs and 9 baseballs. He doesn"t have a ping-pong bat, but he has 8 tennis rackets. Of all the sports, He likes tennis best. He likes sports very much, because he thinks sports are good for health. He often plays tennis and basketball with his friends after school.   1.我有一个好朋友。她的名字叫梅。她12岁。她的电话号码是87634966 。她的生日是3月5日。她擅长英语和汉语。她经常弹钢琴。她喜欢看书和听音乐。她的爱好是读书和听音乐。她是一个好女孩。我们经常互相帮助。我们是好朋友。   2.大家好!我是LiMei.看!这是我的全家福。这是我的祖母。她58岁。这是我的父亲。他是一名教师。他36岁。我的母亲也是36岁。那个男孩是谁?哦,他是我哥哥。他13岁,我12岁。我的哥哥和我都是学生。   3. 瞧!这是汤姆的房间。他的照片挂在墙上。他的T恤在床上。他的棒球棒在梳妆台后面。钥匙在抽屉里。计算机在书桌上。汤姆的棒球在哪里?哦,在床底下。地板上是什么?它们是汤姆的鞋子,袜子和电脑游戏。你觉得汤姆的房间怎么样?   4.吉姆拥有一个大的体育用品收藏。他有10个篮球,4个足球,2乒乓球,15个排球和9个棒球。他没有一个乒乓球球拍,但他有8个网球拍。在所有的`运动中,他最喜欢打网球。他很喜欢运动,因为他认为运动是对健康有益的。他经常在放学后和他的朋友们打网球和篮球。   5.自我介绍   My name is Wang Ming.My birthday is June 5th. I am Chinese. I am a student.I study very hard.My favorite subject is English. I like it because it is interesting. I can play the piano and the   trumpet, but not very well. I love swimming and I am good at it.Of all kinds of movies, I like comedies best. I think they"re interesting. I"m one of the best students in my class. My teachers all say I am a good student.They all like me and I like them, too.   6. My English Teacher(我的英语老师)   Miss Wang is my English teacher. She looks very young.She"s about thirty years old, and she wears glasses.She"s funny . But she is strict with us. She wants us to study hard, Her lessons are interesting. We are very happy in her class and we all like her lessons. She is a good teacher, and we all like her.   7.Music Lovers Wanted(招聘音乐爱好者)   We need more music lovers in our club. Do you like musicCan you singCan you danceCan you play the violin, the piano, the guitar or the drumsIf your answers are “yes”, then you can join our music club. Please call Gina at 612-5568.   8. (谈谈你对电影的看法)Of all kinds of movies, I like comedies best. I think they"re interesting. My favorite actor is Jackie. I like his movie King of Comedy. I think it"s a successful comedy. For action movies, I like The Lord of the Ring best. It"s exciting. I like documentaries because they"re true stories. I like only some thrillers. Many thrillers are scary and boring.   5.我的名字是王明.我的生日是6月5日。我是中国人。我是一个学生.我学习很努力.我的最喜欢的科目是英语。我喜欢它,因为它很有趣。我可以弹钢琴和吹喇叭,但不是很好。我喜欢游泳并且我很擅长.在所有种类的电影中,我最喜欢喜剧片。我想他们很有趣。我是我班上最好的学生之一。我的老师都说我是一个很好的学生.他们都喜欢我,我也喜欢他们。   6.王老师是我的英语老师。她看起来很young.She的约三十岁,她穿glasses.She很有趣。不过,她严格要求我们。她要我们努力学习,她的课很有意思。我们非常高兴,在她的课堂,我们都喜欢她的课。她是一位好老师,我们都喜欢她。   7.我们需要在我们的俱乐部更多的音乐爱好者。你喜欢音乐吗?你能唱歌吗?你能跳舞吗?你能拉小提琴,钢琴,吉他,打鼓呢?如果你的答案是“yes”,那么你可以加入我们的音乐俱乐部。请致电612-5568吉娜。   8.在各种各样的电影中,我最喜欢喜剧片。我想他们很有趣。我最喜欢的演员是成龙。我喜欢他的电影“喜剧之王”。我认为这是一个成功的喜剧。至于动作片,我最喜欢“指环王”。它令人兴奋。我喜欢纪录片,因为他们是真实的故事。我只喜欢一些恐怖片。许多恐怖片都太恐怖和无聊。   9.请你写一篇短文介绍你的周末生活。   I have a good weekend. On Saturday morning ,I do my homework. After lunch, I go shopping with my   mother. At about five o"clock, I go to play basketball with my friend. On Sunday, I watch a football game on TV. I often help my mother do housework. I watch TV with my parents in the evening. Then I go to bed at nine o"clock. I"m very happy on weekends.   10.以 My Favorite为题,写一篇短文   My favorite subject is English. I like it because it is interesting. I have English every day. I can speak a little English. I join the school English club. Every afternoon I go there to talk in English. I can see the English movies and read English books. I think it is useful for me. I want to learn it well. I like English very much.   11.介绍你的一日三餐。   Hello, everyone! I don"t like sports, but I like eating very much. I eat a lot food every day. For breakfast, I like milk, eggs and bread a lot . For lunch, I like French fries, chicken, hamburgers and apples. For dinnerr, I like fruits, vegetables and rice.   12.My Day(我的一天)   I get up early at six every day. After doing some morning exercises, I read English for twenty minutes. At seven I have breakfast. After breakfast I take my schoolbag and go to school. Our class begins at eight, and we have four classes in the morning. After lunch at 12 o"clock, I take a short rest in the classroom. We have three more classes in the afternoon.After school at five , I go back home. I often help my mother do some housework. Sometimes I watch TV. After dinner, I begin to do my homework. Then I take a shower. I go to bed at nine thirty.   9.我有一个美好的周末。星期六早上,我做我的功课。午饭后,我和我的母亲去购物。大约5点,我和我的朋友一起玩篮球。星期天,我在电视上观看足球比赛。我经常帮助妈妈做家务。晚上我与我的父母看电视。然后我在九点钟去睡觉。周末我很高兴。   10.我最喜欢的科目是英语。我喜欢它,因为它很有趣。我每一天都有英语课。我会讲一点英语。我参加了学校的英语俱乐部。每天下午我去那里用英语交谈。我可以看英文电影和阅读英文书籍。我想这对我来说是有用的。我想学好它。我非常喜欢英语。   11.大家好!我不喜欢运动,但我很喜欢吃。我每天吃很多食物。早餐,我非常喜欢牛奶,鸡蛋和面包。午餐,我喜欢薯条,鸡肉,汉堡包和苹果。对于晚餐,我喜欢水果,蔬菜和大米。   12.我每天早上六点起床。做了早操后,我读英语20分钟。七点吃早餐。早饭后,我带上我的书包去上学。我们的课始于八点,我们早上有四节课。在12点吃午饭后,我要在教室里作短暂的休息。我们在下午还有3节课。在5点放学后.我回到家里。我经常帮助   妈妈做一些家务,有时候我看电视。晚饭后,我就开始做家庭作业。然后我冲个澡。我在九点半去睡觉。 七年级英语作文 篇7   My mother in our eyes is a beatiful woman.she has rounds eyes,long hair,white cheeks,long eyelash,and black eyebrowns.she works in a school.after works she take us from school and we go back to home together,after this my mother will busy with cooking,cleaning the house and washing dishes and check my home work.I think every day my mother is very tired,but she never said a word.althought sometimes we do not listen,she will be carefully to teach us.   My mother loves us and we also love our mother.   我的母亲在我们的眼睛是一个美丽的女人。她有轮的眼睛,长头发,白的脸颊,长睫毛,黑色eyebrowns。她在一所学校工作。工作后,她带我们从学校和我们一起回到家里,在这之后我妈妈忙着做饭,打扫房间和洗碗,检查家里的工作。我认为我妈妈每天很累,但她从来没有说过一个字。虽然有时我们不听,她会仔细地教我们。   妈妈爱我们,我们也爱我们的母亲。 七年级英语作文 篇8   esterda was sunda.it was thirteenthbirthda.i gt up ver earl in the rninganf put n clthes happil. parentsbught e the new clthes as birthdapresents.i invited an f classates tce t birthda part in the evening. inthe evering ,ang f lassates cae t he . the bught e a lt f beautifulpresents. the all said "happ birthda t u!" at the end f the part , we ate the birthdacae and se ther delicius fd . Hw happ I was!   M father is bus n weedas but he is freen weeends. He lie plaing sprt with en Saturda rning. We ften plabasetball r table tennis. In the afternnhe ften helps e with hewr. Inthe evening we watch cartns. OnSundas he ften taes e t the pars.Seties we g t The Suer Palaceand seties we g t Zhngshan Par.M father usuall has a happ and clrfulweeends.
2023-07-07 04:09:211