4x(未知数)-1又5/1×3/2=2.8和x/6.4=0.12:1.5

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4x(未知数)-1又5/1×3/2=2.8和x/6.4=0.12:1.5

4x(未知数)-1又5/1×3/2=2.8和x/6.4=0.12:1.5
4x(未知数)-1又5/1×3/2=2.8和x/6.4=0.12:1.5
 

4x(未知数)-1又5/1×3/2=2.8和x/6.4=0.12:1.5
4x-1又5/1×3/2=2.8
4x-4/5=2.8
4x-0.8=2.8
4x=3.6
x=0.9
6.4/x=0.12:1.5
6.4/x=12/150
12x=960
x=80
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