в) (11/18 − 1 7/12) · (2 1/6 + 7/30)

\((\frac{11}{18}-1\frac{7}{12})\cdot(2\frac{1}{6}+\frac{7}{30})=(\frac{11}{18}-\frac{19}{12})\cdot(\frac{13}{6}+\frac{7}{30})\)

\(=(-\frac{35}{36})\cdot\frac{12}{5}=-\frac{7}{3}\)

Ответ: \(-\frac{7}{3}\).