Задание

Найдите знаки множителей:

\(\displaystyle \times\) [?||-]\(\displaystyle 2\) \(\displaystyle -1\)
[?||-]\(\displaystyle 6\) \(\displaystyle 12\) \(\displaystyle -6\)
[?||-]\(\displaystyle 4\) \(\displaystyle -8\) \(\displaystyle 4\)