2400/1.5x+2400/x=40

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2400/1.5x+2400/x=402400/1.5x+2400/x=402400/1.5x+2400/x=402400÷1.5=1600所以约分1600/x+2400/x=404000/x=40x

2400/1.5x+2400/x=40
2400/1.5x+2400/x=40

2400/1.5x+2400/x=40
2400÷1.5=1600
所以约分
1600/x+2400/x=40
4000/x=40
x=4000÷40
x=100