2(x+1)-3(x-2)

x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2) 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 1+x+x^2+x^3+.+x^99+x^100 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4) x(x+1)^3+x(x+1)^2+x(x+1)+x+1因式分解 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 化简（X+2)\（X^2+X)+(2X+1)\（X^2+3X+2)-(X-3)\(X^2+2X) 就这两道题,1、|x+1|+|x-2||x+1|+|x-2|+|x-1||x+2|+|x-2|+|x+3|+|x-1|| (x+2/x^2-x-6)-(2x/x^2-3x)-(x+1/x^2-6x+9) x+2/x^2-x-6 + 2x/x^3-3x - x+1/x^2-6x+9