已知AB是抛物线y
2=2Px的任意一条焦点弦,且A(x
1,y
1),B(x
2,y
2).
(1)求证y
1y
2=-p
2,x
1x
2=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702385803/SYS201310232121217023858017_ST/0.png)
;
(2)若弦AB被焦点分成长为m,n的两部分,求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702385803/SYS201310232121217023858017_ST/1.png)
.
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702385803/SYS201310232121217023858012_ST/2.png)
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