9×3-1.7X=13又5分之2

问题描述:

9×3-1.7X=13又5分之2
5分之2X+1又5分之2X=36

9*3-1.7X=13又2/5
1.7x=27-13又2/5=13又3/5
x=68/(5*1.7)
x=8
2x/5+7x/5=36
9x/5=36
x=36/(9/5)=36*5/9
x=20