12/(1-9x^2)-(3x+1)/(3x-1)=(1-3x)/(1+3x)

如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 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| 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 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 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 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 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), (x^21+x^15+x^12+x^9+x^6+x^3+1)/(x^2+x+1) x+2/x+3－x+1/x+2=x+8/x+9－x+7/x+8 （1） x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8