已知n^2+n-1=0求n^3+2n^2+2009的值快.

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已知n^2+n-1=0求n^3+2n^2+2009的值快.已知n^2+n-1=0求n^3+2n^2+2009的值快.已知n^2+n-1=0求n^3+2n^2+2009的值快.n²+n-1=0

已知n^2+n-1=0求n^3+2n^2+2009的值快.
已知n^2+n-1=0求n^3+2n^2+2009的值
快.

已知n^2+n-1=0求n^3+2n^2+2009的值快.
n²+n-1=0
n²+n=1
n³+2n²+2009
=(n³+n²)+n²+2009
=n(n²+n)+n²+2009
=n+n²+2009
=1+2009
=2010今年.