920. Вычислите: а) 756/1925 · 350/1176; б) 350/756 : 1925/1176; в) 756/1176 : 350/1925; г) 1176/350 · 1925/756.

1. а) \(\frac{756}{1925}\cdot\frac{350}{1176}=\frac{9}{14}\cdot\frac{2}{11}=\frac{9}{77}\).
2. б) \(\frac{350}{756}:\frac{1925}{1176}=\frac{25}{54}\cdot\frac{1176}{1925}=\frac{25}{54}\cdot\frac{196}{275}=\frac{196}{693}\).
3. в) \(\frac{756}{1176}:\frac{350}{1925}=\frac{9}{14}:\frac{2}{11}=\frac{9}{14}\cdot\frac{11}{2}=\frac{99}{28}\).
4. г) \(\frac{1176}{350}\cdot\frac{1925}{756}=\frac{14}{9}\cdot\frac{11}{2}=\frac{77}{9}\).

Ответ: а) \(\frac{9}{77}\); б) \(\frac{196}{693}\); в) \(\frac{99}{28}\); г) \(\frac{77}{9}\).