1/5X+(1/5x-15)=1/3x

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 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 因式分解 (x+1)(x+3)(x+5)(x+7)+15 换元法 (x+1)(x+3)(x+5)(x+7)+15 (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 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),