已知M^2+3M+6=9,则代数式1/3M^2+M-2=?
问题描述:
已知M^2+3M+6=9,则代数式1/3M^2+M-2=?
答
M^2+3M=3
1/3M^2+M-2
=1/3(M^2+3M)-2
=1/3*3-2
=-1