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一個長方體,高新增5cm後就成了正方體,表面積新增了4個以正方體的棱長為長;以5釐米為寬的長方形. 每個面的面積:160÷4=40(平方釐米) 正方體的棱長:40÷5=8(釐米) 所以,長方體的長是8釐米;寬也是8釐米;高是:8-5=3(釐米) 原長方體的體積是:8×8×3=192(立方釐米)
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