本文主要针对椭圆的第二定义的巩固及应用采撷几例与读者共切磋,望对大家有所帮助.一、椭圆的第二定义若平面内的动点M(x,y)到定点F(c,0)的距离和它到定直线l:x=(a~2)/c距离的比是常数c/a(a>c>0),则点M的轨迹为椭圆,定直线l叫作椭圆的准线.注一般地,如果遇到动点到两个定点的 This article is mainly aimed at the consolidation of the second definition of the ellipse and the application of a number of examples to share with the readers, hope to help everyone. First, the second definition of the ellipse if the moving point in the plane M (x, y) to the fixed point F ( The distance between c,0) and its distance from the fixed line l:x=(a~2)/c is a constant c/a (a>c>0). Then the trajectory of point M is an ellipse, and the fixed line l is called. Make the alignment of the ellipse. Note In general, if you encounter a moving point to two fixed points