利用焦半径公式|PF1|=a+ex0,|PF2|=a-ex0(a、e分别是椭圆长半轴长及离心

利用焦半径公式|PF1|=a+ex0,|PF2|=a-ex0(a、e分别是椭圆长半轴长及离心率,x0为P点横坐标),在椭圆=1上求一点M,使它到左焦点的距离是它到右焦点距离的两倍.

答案

解:设M(x0,y0),由a=5,b=3得c=4,e=.

设F1、F2分别为椭圆的左、右焦点,则|PF1|=a+ex0=5+x0,|PF2|=5-x0.

由题知5+x0=2(5-x0),x0=.

把x0=代入椭圆方程=1,得y=.

∴点M的坐标为().

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