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八年级数学：怎么求∠BA´C的度数？正方形折叠问题，一道口算题
八年级数学：怎么求∠BA´C的度数？正方形折叠问题，一道口算题
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244/254
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