Question

如m的平方+m-1=0则m的三次方+2乘以m的平方-2001=?

Answer 1

m^2+m-1=0

m^3+2m^2-2001

=m^3+m^2-m+m^2+m-1-2000

=m(m^2+m-1)+(m^2+m-1)-2000

=-2000