m^+2mn+2n^-6n+9

问题描述:

m^+2mn+2n^-6n+9
是 m^+2mn+2n^-6n+9,求M和N

m^+2mn+2n^-6n+9
=mˇ+2mn+nˇ+nˇ-6n+9
=(m+n)ˇ+(n-3)ˇ