x：3.2=2.5：4

x+x-2.5+x-4=85 3.2+x=4.6 x-2.08=5.76 1.2x=0.84 3x+0.5x=4.2 4x-2.16=1.2 x-0.2x=16 2x-4*2.5=3.6 x除以5.4=0.26 x：3.2=2.5：4 0.95*4+6x=5 4.2(x-2)=8.4 (x+3.2)*0.4=1.6 x-1.1+0.6=2.4 8.7(x-5.9)=09.2x-x=49.2 x+2.5x=0.7 x-0.76x=0.96 12x=300-4x 0.4x+3.2=2.5x+0.05 X是多少 0.5x(x+4)-0.4(x+4)=3.2 9^x+4^x=2.5*6^x 4-x=2(-0.5x²+2.5x-2) 2.5x-4x(2000-x)=1100 x+11.2=4x-3.2 3.2x:3=(x+1):4 4x-3.2x=6. 4x-2.5=1.8.x=? 方程：10.5{x-4}=2.5x 3.5X+2.5(14-X)=4 4x-15=2.5x 10.5（x-4）=2.5x x/(2.5x-10)=4/9