Задание

Найдите знаки множителей:

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