已知抛物线 y^2=2px(p>0)过定点M(p,0)作一弦PQ,则1/[MP]^2+1/[MQ]^2
已知抛物线 y^2=2px(p>0)过定点M(p,0)作一弦PQ,则1/[MP]^2+1/[MQ]^2
线段mp的平方的倒数
线段mp的平方的倒数
数学人气:375 ℃时间:2020-03-28 03:08:27
优质解答
设P(2pmm.2pm)Q(2pnn,2pn)PQ:(m+n)y - x -2pmn=0过M(p,0),代入得mn = -1/2MP*MP = (1+(m+n)^2)*(2pm)^2MQ*MQ = (1+(m+n)^2)*(2pn)^21+(m+n)^2 = 1+mm+nn+2mn=mm+nn=>1/[MP]^2+1/[MQ]^2 = (mm+nn)/((mm+nn)*4ppmmnn)=...
我来回答
类似推荐
猜你喜欢
- 1somentimes i eat out with our friends,we have fish,vegetables and fruits翻译
- 2与“water,noodle,juice,orange"同类的单词
- 3We were watching TV when the telephone rang. 里的
- 4以The importance of English写一篇作文
- 5英语如何说:人体正常生长需要淀粉、蛋白质、脂肪、水、维生素和矿物质.维生素A缺乏会得夜盲症;维生素C缺乏会得坏血病.缺典会得甲亢,俗称大脖子病;缺钙会骨质疏松;缺铁会贫血.下列食物含维生素A、维生素C、典、钙、铁分别是什么?
- 6they s ()happy birthday to m()
- 7能简算要简算!1.(27/4-19/5)÷4/5 2.(14/29*29+58/9*29)*5/4
- 8必要条件假言命题
- 9请写出一个原命题是真命题,而逆命题是假命题的命题
- 10x^2-4x+4分之2x-6÷(x-+3)×3-x分之x^2+x-6计算