x-(x÷2-40)-(x÷2÷2+40)=60

[x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简[x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简 化简(x^2-2x+1)/(x^2+1)÷(x-1)/(x^2+x)-x [(x-4)/(x-4x+4)-(x-2)/(x+2)]÷x/(x-2) 【{x²-4x+4/x²-4}-x/x+2】÷x-1/x+2 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x (x^2-x-6)÷(x-3) 化简 [3x/(x+2)-x/(x=2)]÷x/(x^2-4)化简 [3x/(x+2)-x/(x-2)]÷x/(x^2-4 3x/(x-2)-x/(x+2)÷2x/(x-4)化简3x/（x-2）-x/(x+2)÷2x/(x²-4)化简 (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 x/x^2-2x÷(x^2-4)^-1 化简：2|x| -3x÷|2x-|5x|| 化简||x|-2x|÷(|x-3|-|x|) 设f(x)=x+2÷x(x (-x)^5÷x^2 (x²-x+1)÷(x²-x-1)=(x²+x)÷(x²+x-2)解方程 (2x-6)/(x^2-9)+(x^2+2x+1)/(x^2+x-6)÷(x+1)/(x-2) X^2-3X-2=0,求( x - 2x-1/x )÷(x-1)/(x^2-2x) (x+2/x^2-2x-x-1/x^2-4x+4)÷4-x/x