Найдите сумму многочленов:
\(\displaystyle \left(3xy^{\,3}z+7xz^{\,2}+2xyz+120xy\right)+\left(3x^{\,4}z^{\,4}+12xy^{\,3}z+5xz^{\,2}+4xyz\right)=\)
\(\displaystyle =\)[ ]\(\displaystyle xy^{\,3}z\,+\)[ ]\(\displaystyle xz^{\,2}+\)[ ]\(\displaystyle xyz+120xy+3x^{\,4}z^{\,4}\)