Раскройте скобки:

\(\displaystyle -3 \cdot (-x-y\,)=\)[?||-][ ][?|+|-][ ]

\(\displaystyle -(-a-b\,)=\)[?||-][ ][?|+|-][ ]

\(\displaystyle -a\cdot (-u-w\,)=\)[?||-][ ] [?|+|-][ ]