已知 m²+m-1=0,求m³+2m²+2005
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m²=-m+1
所以m³=m×m²
=m(-m+1)
=-m²+m
所以原式=-m²+m+2m²+2005
=m²+m-1+2006
=0+2006
=2006
所以m³=m×m²
=m(-m+1)
=-m²+m
所以原式=-m²+m+2m²+2005
=m²+m-1+2006
=0+2006
=2006
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m²+m-1=0
m²+m=1
m³+2m²+2005
=m³+m²+m²+2005
=m(m²+m)+m²+2005
=m+m²+2005
=1+2005
=2006
m²+m=1
m³+2m²+2005
=m³+m²+m²+2005
=m(m²+m)+m²+2005
=m+m²+2005
=1+2005
=2006
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m³+2m²+2005
=m(m²+m-1)+m²+m+2005
=0+m²+m+2005
=m²+m-+2006
=0+2006
=2006
=m(m²+m-1)+m²+m+2005
=0+m²+m+2005
=m²+m-+2006
=0+2006
=2006
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