x+x^-1=3,则x^2+x^-2=?

x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 若x+x^2+x^3=-1 则x^2012+x^2011+x^2010+x^2009+…………+x^3+x^2+x+1= x^3+x^2+x+1=0,则x^97+x^98+x^99+.x^103= f(x)=x(x-1)(x-2)(x-3).(x-n),则f(x)的n+1阶求导 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值 x/x平方-x+2=2x/x+1 f(x-1)=x^2-2x+3(x (x+3)×(x+2)×(x+1)×x=3024 f(x)=(x-1)(x-2).(x-3)求导