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已知:長方體的長=寬新增的高度是2 所以新增的表面積=2*長*高+2*寬*高 2*長*2+2*長*2=56 4*長+4*長=56 得:長=7 所以:寬=7原來的高=長-2=5 長方體的體積=長*寬*高=7*7*5=245立方釐米
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