№ 169. Вычислите: а) 23/24 − (1/6 + 1/4); б) 4/35 + (3/5 − 4/7); в) 11/15 − (2/3 − 3/20); г) 5/18 + (2/9 + 1/27).

а) \(\frac{23}{24}-\left(\frac{1}{6}+\frac{1}{4}\right)=\frac{23}{24}-\frac{10}{24}=\frac{13}{24}\).

б) \(\frac{4}{35}+\left(\frac{3}{5}-\frac{4}{7}\right)=\frac{4}{35}+\frac{1}{35}=\frac{1}{7}\).

в) \(\frac{11}{15}-\left(\frac{2}{3}-\frac{3}{20}\right)=\frac{44}{60}-\frac{31}{60}=\frac{13}{60}\).

г) \(\frac{5}{18}+\left(\frac{2}{9}+\frac{1}{27}\right)=\frac{15}{54}+\frac{14}{54}=\frac{29}{54}\).

Ответ: а) \(\frac{13}{24}\); б) \(\frac{1}{7}\); в) \(\frac{13}{60}\); г) \(\frac{29}{54}\).