圆N：x^2+y^2+2x+2y-2=0(x+1)^2+(y+1)^2=4圆心坐标为(-1,-1),半径为=2圆M；x^2+y^2-2mx+2ny+m^2-1=0(x-m)^2+(y+n)^2=n^2+1圆心坐标为(m,-n),半径=√(n^2+1),半径只受n影响两交点平分圆N圆周,说明A,B连线就是圆N直径,...