5) -1,7 + \(\frac{4}{9}\) =

\(-1.7=-\frac{17}{10}\).

\(-\frac{17}{10}+\frac{4}{9}=\frac{-153+40}{90}=-\frac{113}{90}=-1\frac{23}{90}\).

Ответ: \(-1\frac{23}{90}\).