求经过点M(-2,1)且与A(-1,2),B(3,0)距离相等的直线方程.
考点分析:
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如下图,椭圆中心为O,F是焦点,A为顶点,准线l交OA延长线于B,P,Q在椭圆上且PD⊥l于D,QF⊥OA于F,则以下比值①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508579066613/SYS201311012245085790666014_ST/0.png)
②
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③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508579066613/SYS201311012245085790666014_ST/2.png)
④
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508579066613/SYS201311012245085790666014_ST/3.png)
⑤
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能作为椭圆的离心率的是
(填写所有正确的序号)
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与双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508579066613/SYS201311012245085790666012_ST/0.png)
有共同的渐近线,且经过点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508579066613/SYS201311012245085790666012_ST/1.png)
的双曲线的一个焦点到一条渐近线的距离是
.
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从点P(2,3)向圆(x-1)
2+(y-1)
2=1引切线,则切线方程为
.
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点P(2,4)在直线ax+y+b=0上的射影是点Q(4,3),则a=
,b=
.
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