Раскройте скобки:

\(\displaystyle -7\cdot (-i+k\,)=\)[?||-][ ] [?|+|-][ ]

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

\(\displaystyle -b\cdot (-c+d\,)=\)[?||-][ ] [?|+|-][ ]