建筑工地用5辆大车和4辆小车一次运来沙石42.5吨,每辆大车比每辆小车多运4吨,每辆大车和每辆小车各运沙石多少吨?能不能写出算式…… 他们明明说每辆大车比每辆小车多运4吨,你们的答案都不对啊……

问题描述:

建筑工地用5辆大车和4辆小车一次运来沙石42.5吨,每辆大车比每辆小车多运4吨,每辆大车和每辆小车各运沙石多少吨?
能不能写出算式……
他们明明说每辆大车比每辆小车多运4吨,你们的答案都不对啊……

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4.5
2.5

5辆大车多运4吨,就是5*4=20 42.5-20=22.5 22.5除9=2.5 所以九辆车如果都是小车的话就是每辆2.5吨咯,然后那5辆大车再分别加4吨就是7.5 所以小车2.5 大车7.5 我刚才算错了,这个是对的,杀了我很多脑细胞啊

5(x+4)+5x=42.5 「设的是小车的吨数」算出来是,小车:2.25 大车:7.25