Question

已知m的平方减m减一等于0，求代数式m的立方减2m加2005的值

Answer 1

m^2-m-1=0

m^3-2m+2005

=m^3-m^2-m-m^2+m+1+2004

=m(m^2-m-1)-(m^2-m-1)+2004

=0m-0+2004

=2004

为你解答，如有帮助请采纳，

如对本题有疑问可追问，Good luck!