Задание
Расставьте знаки в произведениях:
| \(\displaystyle \times\) | \(\displaystyle a\) | \(\displaystyle -b\) |
| \(\displaystyle -c\) | [?||-]\(\displaystyle a\cdot c\) | [?||-]\(\displaystyle b\cdot c\) |
| \(\displaystyle -d\) | [?||-]\(\displaystyle a\cdot d\) | [?||-]\(\displaystyle b\cdot d\) |