一条船可以运260吨货物，体积是1000立方米．甲货物每吨占8立方米，乙货物每吨占2立方米，怎样安排最合理？
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口算 55+37= 80﹣26= 1400﹣800= 2+210= 9+300= 82+0= 1﹣= += ﹣= ．
口算我最棒.+=+=﹣=﹣=+= 1+=﹣0.2=+0.3=+= 1﹣+=﹣﹣=++=
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