3(0.72-x+1)=4.80.72-x+1=1.6-x=-0.12x=0.12x÷7=0.7+13.3x÷7=14x=98(1.2+x)5=151.2+x=3x=1.8 纯手打 望采纳
x等于0.12自己套吧
