Найдите пропущенные значения:
\(\displaystyle (-28st^{\,7}u+15tu\,)(3s^{\,4}t^{\,2}u-9s^{\,7}t\,)=\)
\(\displaystyle =\)[?||-][ ]\(\displaystyle (3s^{\,4}t^{\,2}u-9s^{\,7}t\,)\)[?|+|-][ ]\(\displaystyle (3s^{\,4}t^{\,2}u-9s^{\,7}t\,)\)