若m^2+m-1=0,求m^3+2m^2+2008等于多少?
问题描述:
若m^2+m-1=0,求m^3+2m^2+2008等于多少?
答
得m ^2+m=1 =m(m ^2+m)+m ^2+2008 =m+m ^2+2008 =2009
若m^2+m-1=0,求m^3+2m^2+2008等于多少?
得m ^2+m=1 =m(m ^2+m)+m ^2+2008 =m+m ^2+2008 =2009