已知 m²+m-1=0,求m³+2m²+2005
展开全部
m²=-m+1
所以m³=m×m²
=m(-m+1)
=-m²+m
所以原式=-m²+m+2m²+2005
=m²+m-1+2006
=0+2006
=2006
所以m³=m×m²
=m(-m+1)
=-m²+m
所以原式=-m²+m+2m²+2005
=m²+m-1+2006
=0+2006
=2006
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
m²+m-1=0
m²+m=1
m³+2m²+2005
=m³+m²+m²+2005
=m(m²+m)+m²+2005
=m+m²+2005
=1+2005
=2006
m²+m=1
m³+2m²+2005
=m³+m²+m²+2005
=m(m²+m)+m²+2005
=m+m²+2005
=1+2005
=2006
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
m³+2m²+2005
=m(m²+m-1)+m²+m+2005
=0+m²+m+2005
=m²+m-+2006
=0+2006
=2006
=m(m²+m-1)+m²+m+2005
=0+m²+m+2005
=m²+m-+2006
=0+2006
=2006
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询