6.2x+2x=12.

6.2x+2x=12. 10x -6.2x-2x=36 x=? f(x)=x^2+x (x 1.(1/X-1 )-2=X^-3X/X^-12.（X/X+1)^+5(X/X+1)+6=03.（8(X^+2X)/X^-1）+ 3（X^-1)/X^+2x 10x+2x+5=3x+2x-12.x=? 10x+2x+5=3x+2x-12.x=? x^2=x x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x平方-x+2=2x/x+1 f(x)=x|x|+2x (x (X+1)X(X+2)X(X+3)=504 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X 6.2x-x=41.6 ,2x +1.5x=17.5,x-.36x=16解, x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 5x+(8-x)=12.6x-(12+2x)=4怎么做5x+(8-x)=12. 2x-7/4x=13 3x+1/3x=20/21 x-0.28x=12. 4.8x+6.2x-x=4.8