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parry99,畫個示意圖(我沒畫)就可以知道,新增的部分是一個6×6正方形和兩個長寬分別是6和正方形邊長的長方形.所以,正方形的邊長是:(156-6×6)÷2÷6=10(釐米)原來正方形的面積是:10×10=100(平方釐米)驗…
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