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八年级数学：怎么求证四边形ADCF是菱形？怎么求菱形ADCF的面积？
八年级数学：怎么求证四边形ADCF是菱形？怎么求菱形ADCF的面积？
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242/254
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