1. Выполните действие: a) 1,6 ⋅ (-4,5); б) -135,2 : (-6,5); в) -1$$\frac{7}{8}$$ ⋅ 1$$\frac{1}{3}$$; г) 1$$\frac{2}{3}$$ : (-3$$\frac{1}{3}$$)

Решение: a) 1,6 ⋅ (-4,5) = -7,2 б) -135,2 : (-6,5) = 20,8 в) -1$$\frac{7}{8}$$ ⋅ 1$$\frac{1}{3}$$ = -$$\frac{15}{8}$$ ⋅ $$\frac{4}{3}$$ = -$$\frac{15 ⋅ 4}{8 ⋅ 3}$$ = -$$\frac{5 ⋅ 1}{2 ⋅ 1}$$ = -$$\frac{5}{2}$$ = -2,5 г) 1$$\frac{2}{3}$$ : (-3$$\frac{1}{3}$$) = $$\frac{5}{3}$$ : (-$$\frac{10}{3}$$) = $$\frac{5}{3}$$ ⋅ (-$$\frac{3}{10}$$) = -$$\frac{5 ⋅ 3}{3 ⋅ 10}$$ = -$$\frac{1 ⋅ 1}{1 ⋅ 2}$$ = -$$\frac{1}{2}$$ = -0,5 Ответ: a) -7,2; б) 20,8; в) -2,5; г) -0,5