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大圓半徑是小圓半徑的1.5倍 則大圓的面積是小圓的面積的1.5×1.5=2.25倍 大圓的面積比小圓的面積多 2.25-1=1.25倍 小圓的面積是 62.8÷1.25=50.24平方分米 大圓的面積是 50.24×2.25=113.04平方分米
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