1.解方程8x-6x7=46.8 8x-42=46.8 8x=88.8 x=11.1 2.解方程2x+4.5x6=51 2x+27=51 2x=24 x=12 3.解方程1.6x+2.4x=10.4 4x=10.4 x=2.6