1)|PF2|=|F1F2|√[(a-c)+b]=2ca-2ac+c+b=4ca-2ac+a-c=3ca-ac-2c=0(a-2c)(a+c)=0a=2c,c/a=1/2,离心率e=1/2 2)AB两点没说?
设椭圆C:x^2/a^2+y^2/b^2=1(a>b>0)的左右焦点分别为F1,F2,点P(a,b)满足|PF2|=|F
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