解:x-1/2(x-1/2(x-1))
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
{2X+1}+{X}
x^2-|x|+1
|x-1|+|x-2|
解不等式x*x+1/2x(3-2x)
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
化简:x(x^2+x)/x^2(x^2-1)
x/x平方-x+2=2x/x+1
解方程(x-6)(x^2+x+1)-x(x+1)(x-1)=x(2-5x)