2x+18*(6x/9)+17*(2x/9)=12.8
问题描述:
2x+18*(6x/9)+17*(2x/9)=12.8
答
2x+18*(6x/9)+17*(2x/9)=12.8
2x+12x+34x/9=12.8
160x/9=12.8
x=12.8*9/160=0.72