檢視椭圆形的几何性质的原始碼

'''椭圆形的几何性质'''<ref>[https://zhidao.baidu.com/question/989673500419820059.html?fr=wwwt&word=%E6%A4%AD%E5%9C%86%E7%9A%84%E5%87%A0%E4%BD%95%E6%80%A7%E8%B4%A8&dyTabStr=MCwxLDMsMiw0LDUsNiw3LDgsOQ== 椭圆的几何性质]百度知道</ref>  
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