化简 (2x-1)(2x+1)-(4x+3)(x-1)

x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 化简：1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+1(x+3)(x+4) 化简：1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4) 化简3x^2(x-1)-3x(x^2+1)+4x(2X-5) x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4) x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2) 化简（X+2)\（X^2+X)+(2X+1)\（X^2+3X+2)-(X-3)\(X^2+2X) x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 |x^2-3x-4|>x+1 (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3