已知m*m+m-1=0,求m*m*m+2m*m-2005
问题描述:
已知m*m+m-1=0,求m*m*m+2m*m-2005
答
m*m+m-1=0 m²+m=1
m*m*m+2m*m-2005=m³+2m²-2005=m﹙m²+m﹚+m²-2005=m+m²-2005=-2004