已知m^2+m-1=0求m^3+2m^2+2015的值

2025-01-19 17:04:22
推荐回答(3个)
回答1:

m=-1 m^3+2m^2+2015=(-1)+2*1+2015=2016

回答2:

回答3:

m^3+2m^2+2015
=m(1-m)+2(1-m)+2015
=-m^2-m+2017
=-(1-m)-m+2017
=2016