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表面積减少的是高為3釐米的前後左右四個面的面積.因為能變成正方體說明高為3釐米的前後左右四個面的面積相等. 60除以4除以3=5釐米是長或寬.原來的高為5+3= 8釐米 5x5x2+5x8x4=210平方釐米
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