Вариант 1. 1. Выполните действия: а) 1 5/7 : 1 1/7; б) 3 1/5 : 2 2/15; в) 5 2/3 : 1/3 − 1 7/12 · 6.

а) \(1\frac57:\,1\frac17=\frac{12}{7}:\frac87=\frac{12}{7}\cdot\frac78=\frac32=1\frac12\).

б) \(3\frac15:\,2\frac{2}{15}=\frac{16}{5}:\frac{32}{15}=\frac{16}{5}\cdot\frac{15}{32}=\frac32=1\frac12\).

в) \(5\frac23:\frac13-1\frac7{12}\cdot6=\frac{17}{3}\cdot3-\frac{19}{12}\cdot6=17-\frac{19}{2}=\frac{15}{2}=7\frac12\).

Ответ: а) \(1\frac12\); б) \(1\frac12\); в) \(7\frac12\).