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一、构造函数,通过求函数的值域获得变量的取值范围例1若点O和点F分别为椭圆x2/4+y3/2=1的中心和左焦点,点P为椭圆上的任意一点
First, the constructor, by seeking the value range of the function variable to obtain the range of values Example 1 If the point O and point F are elliptic x2 / 4 + y3 / 2 = 1 center and left focus point P is any a little