变式—实验—探究——利用几何画板探究椭圆性质的一个案例

SHU XUE JIAO XUE ›› 2012, Vol. 1 ›› Issue (2) : 18-21.

SHU XUE JIAO XUE ›› 2012, Vol. 1 ›› Issue (2) : 18-21.

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