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新增的1個面的面積:96÷4=24(平方釐米);長方體的長(寬):24÷3=8(釐米);長方體的高:8-3=5(釐米);體積:8×8×5=320(立方釐米);答:原來這個長方體的體積是320立方釐米.
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