Задание

Расставьте знаки в произведениях:

\(\displaystyle \times\) \(\displaystyle 2\) \(\displaystyle -1\)
\(\displaystyle -3\) [?||-]\(\displaystyle 6\) [?||-]\(\displaystyle 3\)
\(\displaystyle -4\) [?||-]\(\displaystyle 8\) [?||-]\(\displaystyle 4\)