已知n²+n-1=0,求n³+2n²+2009的值
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已知n²+n-1=0,求n³+2n²+2009的值
已知n²+n-1=0,求n³+2n²+2009的值
已知n²+n-1=0,求n³+2n²+2009的值
n³+2n²+2009
=n³+n²-n+n²+n-1+2010
=n(n²+n-1)+(n²+n-1)+2010
=0+0+2010
=2010