2(2.5+x)=5.6,

2*x*x+2.5x=13 x=? 2(2.5+x)=5.6, 3道简单的分式方程,1.3/(1-x^) = 2/(1+2x+x) - 5/1-2x+x^2.5x/(x^+x-6) + (2x-5)/(x^-x-12) = (7x-10)/(x^-6x+8)3.(x+1)/(x+2) + (x+6)/(x+7) = (x+2)/(x+3) + (x+5)/(x+6) 2x:16-2x=2.5x:20-2.5x x=爱克斯（未知数） f(x)=x^2+x (x 5x+2x+x=5.6解方程 5.6+2X=11.6-3X,求X 5.6x-x=3x(5-2)求解 2X+2.5(x+0.04)=11.1X=多少 2(x+1)-(3-x)=2(1.5x-2.5) 4-x=2(-0.5x²+2.5x-2) 5.6-x=3(5-2x) x-2.5=9.5-2x 19.8x+0.2x=2.5×2 2(x+2.5)=5x x/2-x/2.5=50 解方程X-0.5X=15 X-0.8X=10 2.5X+2X=9 接下列方程.前3题验算.x+5.6=9.4 2x=1.6 x÷12=6 x-4=12.6 x÷2.5=6 3.08+x=3.8 (x不是乘号)