Вариант 1: 3/4 : 2/5 =; 7/8 : 1/2 =; 5/6 : 3/4 =; 6 : 2/3 =.

1. \(\frac{3}{4}:\frac{2}{5}=\frac{3}{4}\cdot\frac{5}{2}=\frac{15}{8}=1\frac{7}{8}\).
2. \(\frac{7}{8}:\frac{1}{2}=\frac{7}{8}\cdot2=\frac{7}{4}=1\frac{3}{4}\).
3. \(\frac{5}{6}:\frac{3}{4}=\frac{5}{6}\cdot\frac{4}{3}=\frac{10}{9}=1\frac{1}{9}\).
4. \(6:\frac{2}{3}=6\cdot\frac{3}{2}=9\).

Ответ: \(1\frac{7}{8};\ 1\frac{3}{4};\ 1\frac{1}{9};\ 9\).