1. \( 1\frac{2}{3} \div 2\frac{2}{5} \) 2. \( \frac{2}{3} \div 1\frac{1}{10} \)

Решение:

1. \( 1\frac{2}{3} \div 2\frac{2}{5} = \frac{5}{3} \div \frac{12}{5} = \frac{5}{3} \times \frac{5}{12} = \frac{25}{36} \)
2. \( \frac{2}{3} \div 1\frac{1}{10} = \frac{2}{3} \div \frac{11}{10} = \frac{2}{3} \times \frac{10}{11} = \frac{20}{33} \)

Ответ: 1. \( \frac{25}{36} \) 2. \( \frac{20}{33} \)