Задание 16

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

б) $$\frac{0,55 \cdot 2,3}{-2,2} = \frac{0,55}{-2,2} \cdot 2,3 = -\frac{1}{4} \cdot 2,3 = -0,25 \cdot 2,3 = -0,575$$

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