\[\boxed{\mathbf{3.}\mathbf{303.ОК\ ГДЗ - домашка\ на\ }5}\]
Пояснение.
\[\textbf{а)}\ (3 + c)^{4} = (3 + c) \cdot (3 + c) \cdot\]
\[\cdot (3 + c) \cdot (3 + c)\]
\[\textbf{б)}\ (b - 4)^{2} = (b - 4)(b - 4)\]
\[\textbf{в)}\ (x + y)^{2} = (x + y)(x + y)\]
\[\textbf{г)}\ (a - b)^{3} =\]
\[= (a - b)(a - b)(a - b)\ \]