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新增了2個底面積,1個底面積是:18÷2=9(平方釐米) 因9=3×3,所以原長方體的截面邊長是3釐米 原長方體的高3×2=6(釐米) 原長方體的表面積:3×6×4+3×3×2=90(平方釐米) 體積:9×6=54(立方釐米)
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