若m^2-2m=1则3m^2-6m+2012=
问题描述:
若m^2-2m=1则3m^2-6m+2012=
答
m^2-2m=1
3m^2-6m=3(m^2-2m)=3
所以
3m^2-6m+2012
=3+2012
=2015