(x+100)÷五分之三=x5(x+100)=3x5x+500=3x5x-3x=-5002x=-500x=-250
(x+100)÷3/5=x (x+100)×5/3=x 5/3x+500/3=x移项:5/3-x=500/3 2/3x=500/3 x=500/3×2/3 x=250 不知道对不对?