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剪下的最大的圓的直徑是2,最多能剪出:20÷2=10(個),3.14×(2÷2)2=3.14(平方厘米),20×2-3.14×10,=40-31.4,=8.6(平方厘米),答:能剪下10個最大的圓,每個圓的面積是3.14平方厘米,剩下部分的面積是8.6平方厘米.
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