№ 4. Выполните деление 1) 3 \frac{1}{2} : 1 \frac{1}{6}; 2) 15 : \frac{3}{8}

1) 3 \frac{1}{2} : 1 \frac{1}{6} = \frac{3 * 2 + 1}{2} : \frac{1 * 6 + 1}{6} = \frac{7}{2} : \frac{7}{6} = \frac{7}{2} * \frac{6}{7} = \frac{7 * 6}{2 * 7} = \frac{6}{2} = 3. 2) 15 : \frac{3}{8} = \frac{15}{1} : \frac{3}{8} = \frac{15}{1} * \frac{8}{3} = \frac{15 * 8}{1 * 3} = \frac{5 * 3 * 8}{3} = 5 * 8 = 40.