两个对称点设为A(x1,y1) B(x2,y2) 中点M(x,y)有2x=x1+y1 2y=y1+y2①首先M在直线y=kx+2上,其次AB和直线垂直x1²/4+y1²=1x2²/4+y2²=1两式相减并移项(x1+x2)(x1-x2)/4=-(y1+y2)(y1-y2)(y1-y2)/(x1-x...