б) 6/7 − (5/7 − 1/7); г) 7 13/15 − 3 11/30; д) 1/8 · 4/35 · 10/9; е) (1/2 : 3/4 − 4/9) · 5/3.

б) \(\frac{6}{7}-\left(\frac{5}{7}-\frac{1}{7}\right)=\frac{6}{7}-\frac{4}{7}=\frac{2}{7}\).

г) \(7\frac{13}{15}-3\frac{11}{30}=7\frac{26}{30}-3\frac{11}{30}=4\frac{15}{30}=4\frac{1}{2}\).

д) \(\frac{1}{8}\cdot\frac{4}{35}\cdot\frac{10}{9}=\frac{40}{2520}=\frac{1}{63}\).

е) \(\left(\frac{1}{2}:\frac{3}{4}-\frac{4}{9}\right)\cdot\frac{5}{3}=\left(\frac{2}{3}-\frac{4}{9}\right)\cdot\frac{5}{3}=\frac{2}{9}\cdot\frac{5}{3}=\frac{10}{27}\).

Ответ: б) \(\frac{2}{7}\); г) \(4\frac{1}{2}\); д) \(\frac{1}{63}\); е) \(\frac{10}{27}\).