(70+x)×4=560—x

(70+x)×4=560—x (560－x)=(70+x)×4 f(X)={X^2+4x—2,x>=0 X^2—4x—2,x 5x/(x+3)(x+2)+2x-5/(x-4)(x+3)=7x-70/(x+2)(x+4)yaoqiu方程结果, 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 12.75X—8.5X×4=0.925.求X. x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 4x+22=70,x=? 70x=90(x-4) 急用~ 4x+2*(22-x)=70 4x-（25-x）=70 2x（100—X）+70=4X怎么解 x-2x+3x-4x+5x.+99x-100x=25求解 先化简,再求值：（x-2/x-x+2/x)/x-2/4x,x=2011 2x+3x+4x+5x+x+6x+7x=100 (x/x-2)+(2/x*2+2x)-(x+6/x*2-4)化简,=x^2/x(x-2)+(2x-4)/x(x^2-4)-(x^2+6x)/x(x^2-4)=x^2/x(x-2)-(x+2)/x(x-2)=(x-2)(x+1)/x(x-2)=(x+1)/x (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x