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正方形边长8cm，求阴影部分面积．
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如图在长为10cm宽为8cm的矩形的四个角上截去四个全等的小正方形使得留下的图形图中阴影部分面积是原
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将对角线分别为5cm和8cm的菱形改为一个面积不变的正方形则正方形的边长为_______cm.
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