2*x*x+2.5x=13 x=?
(X+X)+(X-X)+(X*X)+(X/X)=100
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程((13x-x^2)/(x+1))(x+(13-x)/(x+1))=42
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
x/x平方-x+2=2x/x+1
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x+17=3(x+13),2x-11.2=0.6x,2.5x-2.17=21.9-5.8x,8(x-1.5)=x+0.6
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
若x=π/3,|x+1|+|x+3|+...+|x+13|-|x+2|-|x+4|-...-|x+12|
先化简,再求值:(x-2/x-x+2/x)/x-2/4x,x=2011
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)