3m^2 n^2+12mn+12+x(mn+2)^2

问题描述:

3m^2 n^2+12mn+12+x(mn+2)^2

=3(m^2n^2+4mn+4)+x(mn+2)^2
=3(mn+2)^2+x(mn+2)^2
=(x+3)(mn+2)^2