设A,B点坐标分别为(x1,y1),（x2,y2）P是AB的中点,所以x1+x2=y1+y2=2,1)将A B坐标带入椭圆方程有,x1^2/4+y1^2/2=1x2^2/4+y2^2/2=1将上两式相减有(x1-x2)(x1+x2)/4+(y1-y2)(y1+y2)/2=0,即(x1-x2)/2+(y1-y2)=0,所以所在...