3／5:x=1／3:2 x=3.6 3:8=15:x x=40 x:9=4：3 x=12 1／4:1／8=x:1／10 x=1／5 1.25:0.25=x:1.6 x=8 3／4:x=3:12 x=3 5:8=40:x x=64 x:3／4=1／5:2／5 x=3／8 140:2=x:5 x=350 6.5:x=3.25:4 x=8X:20=0.4:66X=20*0.4X=4/3 45:9=x:332:4=X:838:60=x:3025:40=x:6011:50=x:10018:25=x:7585:1664=x:6124 14%:X=4.75:57/81) 3X-(1/2+1/4)=7/12 3X=7/12+3/4 3X=4/3 X=4/9 (2) 6.6-5X=3/4-4X 6.6-0.75=-4X+5X X=5.85 (3) 1.1X+2.2=5.5-3.3X 1.1X+3.3X=5.5-2.2 4.4X=3.3 X=3/4=4/3 还有 (0.5+x)+x=9.8÷2 2(X+X+0.5)=9.8 25000+x=6x 3200=450+5X+X X-0.8X=6 12x-8x=4.8 7.5*2X=15 1.2x=81.6 x+5.6=9.4 52－x ＝15 91÷x ＝1.3 X+8.3=10.7 15x ＝3 3x－8＝16 7(x-2)=2x+3 3x+9=2718(x-2)=270 12x=300-4x 7x+5.3=7.4 3x÷5=4.8 30÷x+25=85 1.4×8-2x=6 6x-12.8×3=0.06 410-3x=170 3(x+0.5)=21 0.5x+8=43 6x-3x=18 1.5x+18=3x 5×3-x÷2=8 0.273÷x=0.35 1.8x=0.972 x÷0.756=90 9x-40=5 x÷5+9=21 48-27+5x=31 10.5+x+21=56 x+2x+18=78 (200-x)÷5=30 (x-140)÷70=4 0.1(x+6)=3.3×0.4 4(x-5.6)=1.6
