Задание 16

а) \frac{3,2 - 6,9}{3,7} = \frac{-3,7}{3,7} = -1

б) \frac{0,55 \cdot 2,3}{-2,2} = \frac{0,55 \cdot 2,3}{-2,2} = \frac{1,265}{-2,2} = -0,575

г) \frac{1}{\frac{1}{4} - \frac{1}{5}} = \frac{1}{\frac{5}{20} - \frac{4}{20}} = \frac{1}{\frac{1}{20}} = 20