解∶x+1.5x=7.5 2.5x=7.5 ∴x=3
x+1.5x=7.52.5x=7.5x=7.5/2.5x=3
x+1.5x=7.52.5x=7.5x=7.5/2.5x=3
解:2.5x=7.5 x=3
2.5x=7.5x=3