1. Сократите дробь: а) 42/49; б) 50/75; в) (5·12)/(6·20).

1. \(\dfrac{42}{49}=\dfrac{42:7}{49:7}=\dfrac{6}{7}\).
2. \(\dfrac{50}{75}=\dfrac{50:25}{75:25}=\dfrac{2}{3}\).
3. \(\dfrac{5\cdot12}{6\cdot20}=\dfrac{60}{120}=\dfrac{1}{2}\).

Ответ: а) \(\dfrac{6}{7}\); б) \(\dfrac{2}{3}\); в) \(\dfrac{1}{2}\).