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八年级数学：两个正方形，怎么求△ABC的面积？用到完全平方公式
八年级数学：两个正方形，怎么求△ABC的面积？要用到完全平方公式
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147/254
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