椭圆的这个性质能推广到双曲线吗?——也探一道数学竞赛题

SHU XUE JIAO XUE ›› 2015, Vol. 1 ›› Issue (4) : 21-22.

SHU XUE JIAO XUE ›› 2015, Vol. 1 ›› Issue (4) : 21-22.

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