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(1)54÷6=9(平方釐米),正方體的棱長為3釐米;表面積:9×6×4-54,=216-54,=162(平方釐米);(2)體積:33×4,=27×4,=108(立方釐米);答:長方體的表面積是162平方釐米,體積是108立方厘米.
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