①47x -37x=12解:10x=12X=1.2②x+27x=34 解:28x=34x=17/14(3)70%x + 20% x = 3.6解:0.9x=3.6x=44,3X-(1/2+1/4)=7/123X=7/12+3/43X=4/3X=4/95, 6.6-5X=3/4-4X6.6-0.75=-4X+5XX=5.856,1.1X+2.2=5.5-3.3X1.1X+3.3X=5.5-2.24.4X=3.3X=3/4=4/3。