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八年级数学：怎么求PC的长？菱形基础巩固考题，怎么添加辅助线？
八年级：怎么求PC的长？怎么添加辅助线？菱形培优题，学浪计划
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177/254
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