若m²+m-1=0,m³+2m²+2005=急求!

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若m²+m-1=0,m³+2m²+2005=急求!
若m²+m-1=0,m³+2m²+2005=
急求!

若m²+m-1=0,m³+2m²+2005=急求!
m²+m-1=0
m²+m=1 m²=1-m
m³+2m²+2005
=m·m²+2m²+2005
=m(1-m)+2m²+2005
=m-m²+2m²+2005
=m²+m+2005
=1+2005
=2006