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八年级数学：正方形中，怎么求CE的长？勾股定理得方程，孝感中考
八年级数学：正方形中，怎么求CE的长？勾股定理得方程，孝感中考
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214/254
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