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首先立方體的高就是减去的正方形的邊長=1cm 也就是說長方形四個邊各减去兩個1cm(一邊一個) 也就是說現在立方體的長=8-1-1=6 寬=4-1-1=2 所以容積=(8-1-1)(4-1-1)*1=12
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