2(x+x+0.8)÷3=1.2解:2(2X+0.8)÷3=1.22(2X+0.8)=1.2×32(2X+0.8)=3.62X+0.8=3.6÷22X+0.8=1.82X=1.8-0.82X=1X=1÷2X=0.5
2(x+x+0.8)÷3=1.2解方程解:2x+0.8=1.2x3➗22x=1.8-0.8x=0.5