1,三分之二X+75%=34,x2/3=33.25,x=49.875'''''2,(70+X)%=1.4,70+x=140,x=70,3,18%X-12.5%=5.5,0.055x=5.5,x=100,4,(1+35%)X=270%,135x=270,x=0.5,5,15-10%X=1,0.1x=14,x=140,最后一题50乘以18%-1.8X=7.2,9-1.8x=7.2,1.8x=1.8,x=1