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八年级数学：怎么证ACEF是平行四边形？∠B满足什么条件是菱形？
八年级数学：怎么判定ACEF是平行四边形？满足什么条件是菱形？
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88/254
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