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) $1\frac{5}{7}:1\frac{1}{7}=\frac{12}{7}:\frac{8}{7}=\frac{12}{7}\cdot\frac{7}{8}=\frac{3}{2}=1\frac{1}{2}=1,5$

б) $3\frac{1}{5}:2\frac{2}{15}=\frac{16}{5}:\frac{32}{15}=\frac{16}{5}\cdot\frac{15}{32} =\frac{3}{2}=1\frac{1}{2}=1,5$

в) $5\frac{2}{3}:\frac{1}{3}-1\frac{7}{12}\cdot6=7\frac{1}{2}=7,5$

1) $5\frac{2}{3}:\frac{1}{3}=\frac{17}{3}:\frac{1}{3}=\frac{17}{3}\cdot\frac{3}{1}=17$

2) $1\frac{7}{12}\cdot6=\frac{19}{12}\cdot6=\frac{19}{2}=9\frac{1}{2}=9,5$

3) $17-9,5=7,5$