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新增的1個面的面積:60÷4=15(平方釐米);長方體的長(寬):15÷3=5(釐米);長方體的高:5-3=2(釐米);體積:5×5×2=50(立方釐米);答:原來這個長方體的體積是50立方釐米.故答案為:50立方釐米.
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