若n^2+n-1=0 求n^3+2n^2+2005的值

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若n^2+n-1=0求n^3+2n^2+2005的值若n^2+n-1=0求n^3+2n^2+2005的值若n^2+n-1=0求n^3+2n^2+2005的值因为：n^2+n-1=0所以：n^2+n=1

若n^2+n-1=0 求n^3+2n^2+2005的值
若n^2+n-1=0 求n^3+2n^2+2005的值

若n^2+n-1=0 求n^3+2n^2+2005的值
因为：n^2+n-1=0
所以：n^2+n=1
所以：n^3+2n^2+2005=n^3+n^2+n^2+2005
=n（n^2+n）+ n^2 + 2005
=n+ n^2 + 2005
=1 + 2005
=2006