.x×（1+15%）=46 2.12-120%=6 3.3/5x-5%x=5.54.15%x+30%x-5%x=6/5 5.x-32%=3/06 6.(1-15%)x+4=217.1/3x+1/2x=35 8.6.3x-8×7.5%=21 9.0.5:0.25=x:610.1/4:1/7=1/3:(4-x) 11.160×1/4-1.3x=17.9 12.x/5-x/6=0.413.3(...