由m²+m-1=0 得出 m²+2m+1=m+2,即(m+1)²=m+2.
m³+2m²+2008
=m³+2m²+m+2008-m
=m(m²+2m+1)+2008-m
=m(m+1)²+2008-m
=m(m+2)+2008-m
=m²+2m+1+2007-m
=(m+1)²+2007-m
=m+2+2007-m
=2009лл
若M的二次方+m-1=0 求m的三次方+2m的二次方+2008
若M的二次方+m-1=0 求m的三次方+2m的二次方+2008
数学人气:739 ℃时间:2019-10-09 05:08:23
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