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中学生数学2009年第1期(月下)发表了笔者撰写的一篇文章《三角形中的蝴蝶问题》,本文再把蝴蝶问题进一步拓展到凸四边形中,以飨读者.
Middle School Mathematics, No. 1, 2009 (next month) published an article written by the author, “The Butterfly in the Triangle,” and further expanded the butterfly issue to convex quadrilaterals to readers.