Раскройте скобки:

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

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

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