先化简(3x+2)(3x-2)-5x(x-1)-(2x-1)^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 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 5x(3x-2)-(x+1) 1+x+x^2+x^3+.+x^99+x^100 先化简,再求值:x^3+2x^2+x/x^2+2x-8除以（x/x-2 × x+1/x+4),其中x=负5/4 (X-1)^3(x-2)(x-3)^2(x-5) 1/(x+3)-(x-2)/(x^2-5x+6) 先化简,再求值:x(x-1)+2x(x+1)-(3x-1)(2x-5),其中x=2 (2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1