\[\boxed{\text{4.\ 222}}\]
\[\textbf{а)}\ 20 = 16 + 4\]
\[\textbf{б)} - 6 = - 16 + 10\]
\[\textbf{в)} - 8,2 = - 5 + ( - 3,2)\]
\[\textbf{г)} - \frac{4}{9} = - 1 + \frac{5}{9}\]
\[\textbf{д)} - 5\frac{3}{11} = - 4 + \left( - 1\frac{3}{11} \right)\]
\[\textbf{е)}\ 9\frac{1}{5} = 10 + \left( - \frac{4}{5} \right)\]