![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225434095508507/SYS201311012254340955085016_ST/images0.png)
在平面直角坐标系xoy中,如图,已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225434095508507/SYS201311012254340955085016_ST/0.png)
的左、右顶点为A、B,右焦点为F.设过点T(t,m)的直线TA、TB与椭圆分别交于点M(x
1,y
1)、N(x
2,y
2),其中m>0,y
1>0,y
2<0.
(1)设动点P满足PF
2-PB
2=4,求点P的轨迹;
(2)设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225434095508507/SYS201311012254340955085016_ST/1.png)
,求点T的坐标;
(3)设t=9,求证:直线MN必过x轴上的一定点(其坐标与m无关).
考点分析:
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