9^(-x)-2*3^(1-x)=27
化简(x^2+3x+9)/(x^3-27)+(6x)/(9x-x^2)-(x-1)/(6+2x)
求化简:(x^2+3x+9)/(x^2-27)+(6x)/(9x-x^2)-(x-1)/(6+2x)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
化简~(x²+3x+9/x²-27)+(6x/9x-x²)-(x-1/6+2x)
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+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
2x/x^2-9=x-1/x^2-6x+9-1/x+3
1.x/9+x=62.x/x+1 + x+1/2x = 3
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x