2x+2.5乘(x+2.2)=13.6

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2x+2.5乘(x+2.2)=13.62x+2.5乘(x+2.2)=13.62x+2.5乘(x+2.2)=13.62x+2.5(x+2.2)=13.62x+2.5x+5.5=13.64.5x=8.1x

2x+2.5乘(x+2.2)=13.6
2x+2.5乘(x+2.2)=13.6

2x+2.5乘(x+2.2)=13.6
2x+2.5(x+2.2)=13.6 2x+2.5x+5.5=13.6 4.5x=8.1 x=1.8