4.2x-2.5x=13.4

4.2x-2.5x=13.4
4.2x-2.5x=13.4

4.2x-2.5x=13.4
1.7x=13.4 x约等7.9

4.2x-2.5x=13.4
1.7X=13.4
X =7.88

1.7x=13.4x=？稍等

4.2x-2.5x=13.4 二元一次方程：4.2X-2.5X=13.4 4.2X-2.5X=13.26方程 4.2x-7=2.5x+4.9 （X+X)+(X-X)+(X*X)+(X/X)=100 x+x-2.5+x-4=85 x-0.8x=4.2 2*x*x+2.5x=13 x=? X乘X减2.5X=6,　　求X! 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 3x+0.5x=4.2 4x-2.16=1.2 x-0.2x=16 2x-4x[这个x是乘】2.5=3.6 3x+5x=168 怎么解 ２.5x-x=15 x =2.5(x-180) x*x*x*x*x=80000? 0.9x=36 18÷x=12 x+1.45=6 x÷8=4.2 43-x=38 2.5x=600.9x=3618÷x=12x+1.45=6x÷8=4.243-x=382.5x=60x÷4.5=1.26.98-x=6.736.72÷x=6.8解方程 4X减3.7x=12 4.2x加2.5x=1.34 8X减3x=15.6 (x减3）除2=7.5 35X加13x=9.6 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) 5（x-8）=3x 4.2x-9=2.5x+2.9 9（2x-3）-2=5（2x-1）