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本文研究椭圆与双曲线的轨迹方程满足何种条件可以互相转变。问题1设MN是垂直于椭圆x~2/a~2+y~2/b~2=1(a>b>0)长轴的一条动弦,A_1A_2是椭圆的长轴,则动直线
In this paper, we study the trajectory equations of elliptic and hyperbolic curves. Problem 1 Let MN be a chord perpendicular to the long axis of the elliptic x~2/a~2+y~2/b~2=1(a>b>0). A_1A_2 is the long axis of the ellipse, then the moving line