椭圆的选择 --- 介绍 ---

$a\left(x-{x}_{0}{\right)}^{2}+b\left(y-{y}_{0}{\right)}^{2}=c$,

$a{x}^{2}+b{y}^{2}+cx+dy+e=0$,

• 练习形式: .
• 方程形式:
• 变量形式: .
• 每组练习由 个问题组成 ( 完成一组后才给分.).

• Description: 根据椭圆方程确定椭圆, 或反过来求. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games
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