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八年级数学：怎么求证△AOE≌△COF？怎么求EF的长？菱形的性质
八年级数学：怎么求证△AOE≌△COF？怎么求EF的长？菱形的性质
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157/254
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