59. Выполните умножение: 1) 7/16 · 8/49; 2) 4/7 · 8/9; 3) 56/69 · 69/77; 4) 55/72 · 40/99.

1. \(\frac{7}{16}\cdot\frac{8}{49}=\frac{1}{14}\).
2. \(\frac{4}{7}\cdot\frac{8}{9}=\frac{32}{63}\).
3. \(\frac{56}{69}\cdot\frac{69}{77}=\frac{56}{77}=\frac{8}{11}\).
4. \(\frac{55}{72}\cdot\frac{40}{99}=\frac{5}{9}\cdot\frac{5}{9}=\frac{25}{81}\).

Ответ: 1) \(\frac{1}{14}\); 2) \(\frac{32}{63}\); 3) \(\frac{8}{11}\); 4) \(\frac{25}{81}\).