若m^2+m-1=0,求m^3+2m^2+2008的值

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若m^2+m-1=0,求m^3+2m^2+2008的值

m³+2m²+2008
=m(m²+m-1)+m²+m+2008
=m(m²+m-1)+(m²+m-1)+2009
=0+0+2009
=2009