举反例也需分析推理——由平行四边形的判定衍生的命题真假说起

SHU XUE JIAO XUE ›› 2012, Vol. 1 ›› Issue (10) : 9-11.

SHU XUE JIAO XUE ›› 2012, Vol. 1 ›› Issue (10) : 9-11.

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