椭圆的选择 --- 介绍 ---

一个椭圆 (水平或垂直放置) 由下面的方程给出

a(xx 0) 2+b(yy 0) 2=c,

或者

ax 2+by 2+cx+dy+e=0,

其中, 点 (x 0,y 0) ) 是椭圆中心, 椭圆两轴的比值由 ab 的比值确定(如何计算?).

此在线练习可以先给出椭圆图象, 然后让你选择其方程, 或者先给出方程然后让你选择其图象.

练习的配置:
  • .
  • .
  • 每组练习由 ( 完成一组后才给分.).
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