1+0.5x=0.5x71+0.5x=3.50.5x=2.5x=50.75x+0.5x=2.251.25x=2.25等号两边÷1.25x=1.83x+4.5x8=723x+36=723x=36x=12(10-7.5)x=0.125x82.5x=1等号两边÷2.5x=0.4