(-3a^2-9a^3b+12a^4b^2)/(-3a^2)=RT

问题描述:

(-3a^2-9a^3b+12a^4b^2)/(-3a^2)=
RT

(-3a^2-9a^3b+12a^4b^2)/(-3a^2)
=1+3ab-4a²b²
=-(4ab+1)(ab-1)