x+1\x=5\2则x^3+1\x^3=_______

若1/x+x=3,则1/x^2+x^2=_______ x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x f(x)满足f(x)+2f(1/x)=3x,则f(x)=_______ 若2x^2-3x+1=0,则多项式4x^2-6x-5=_______ 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 1.已知f(2x+1)=3x-4,则当f(x)=4时x=_______ 用换元法解方程：[8(x^2+2x)/x^2-1]+[3(x^2-1）/x^2+2x]=11,可设y=_______,则 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 (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 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),