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三個相同的正方體木塊拼成一個長方體,减少的面的個數是 (3-1)×2=4(個) 正方體每個面的面積是 400÷4=100(平方釐米) 因為10×10=100 所以正方體的棱長是10釐米 長方體的體積是 10×10×10×3=3000(立方釐米)
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