Задание

Найдите знаки множителей:

\(\displaystyle \times\) [?||-]\(\displaystyle a\) [?||-]\(\displaystyle b\)
\(\displaystyle -x\) \(\displaystyle a\cdot x\) \(\displaystyle b\cdot x\)
[?||-]\(\displaystyle y\) \(\displaystyle a\cdot y\) \(\displaystyle b\cdot y\)