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初中数学：四边形动点问题，证三角形全等存在性，要记得分类讨论
初中数学：四边形动点问题，证三角形全等存在性，要记得分类讨论
八年级数学：平行四边形，矩形，菱形，正方形，三角形中位线培优111/254
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