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r的平方就是正方形面积@巧求面积@秒思数学 @六年级数学
有两块桌布，一块是正方形的，一块是圆形的。正方形桌布的边长与圆形桌布的半径相等。圆形桌布的面积是28.26平方分米。正方形桌布的面积是多少平方分米？
六年级同步数学课程67/147
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