Раскройте скобки: \( -7\cdot (i+k\,)=\)? ? \( -(x+y\,)=\)? ? \( -b\cdot (c+d\,)=\)? ?

Задание

Раскройте скобки:

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

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

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