设m^2+m-1=0,求m^3+2m^2+2007的值
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设m^2+m-1=0,求m^3+2m^2+2007的值
设m^2+m-1=0,求m^3+2m^2+2007的值
设m^2+m-1=0,求m^3+2m^2+2007的值
m^3+2m^2+2007
=(m^2+m-1)(m+1)+2008
=2008
2008.
先用m^3+2m^2+2007减去(m^2+m-1)*m,得到m^2+m+2007,再减去m^2+m-1,就得到2008。