Часть 3. Вычислите: 1) 7/9 − 5/6 · 4/15; 2) (2/3 − 4/9) · 3/8; 3) 2/7 + 3/8 : 7/32; 4) 5/9 : (7/9 + 11/18); 5) 1 − 4/7 : 16/21.

1. \(\frac79−\frac56\cdot\frac4{15}=\frac79−\frac29=\frac59\).
2. \(\left(\frac23−\frac49\right)\cdot\frac38=\frac29\cdot\frac38=\frac1{12}\).
3. \(\frac27+\frac38:\frac7{32}=\frac27+\frac38\cdot\frac{32}7=\frac27+\frac{12}7=2\).
4. \(\frac59:\left(\frac79+\frac{11}{18}\right)=\frac59:\frac{25}{18}=\frac59\cdot\frac{18}{25}=\frac25\).
5. \(1−\frac47:\frac{16}{21}=1−\frac47\cdot\frac{21}{16}=1−\frac34=\frac14\).

Ответ: 1) \(\frac59\); 2) \(\frac1{12}\); 3) 2; 4) \(\frac25\); 5) \(\frac14\).