5x+1/2=5(x+1/15)

x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 (x/x-1)+(5x-2)/x*x-x=1 求x（有图） 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) ∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=? （x+1)(x+2)(x+5)(x+7)+15 因式分解 因式分解 (x+1)(x+2)(x+5)(x+7)+15 6/x+1=x-5/x^2+x X-5+8*X=7*X-2*X-1 (2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值