椭圆的离心率为2分之根号3∴ c/a=√3/2设c=√3t,a=2t∴ b=t设M(x1,y1),N(x2,y2)设方程为x²/(4t²)+y²/t²=1即 x²+4y²=4t²将直线x+y-1=0,即 y=1-x代入x²+4(1-x)²=4t²...