5.33 Назовите коэффициент выражения: a) 9m·5; б) -3 · (-23x); в) 5с · (-9); г) -2а · 14; д) -а · с; e) -x • (-2).

1. a) 9m ⋅ 5 = 9 ⋅ 5 ⋅ m = 45m. Коэффициент: 45.
2. б) -3 ⋅ (-23x) = -3 ⋅ (-23) ⋅ x = 69x. Коэффициент: 69.
3. в) 5c ⋅ (-9) = 5 ⋅ (-9) ⋅ c = -45c. Коэффициент: -45.
4. г) -2a ⋅ 14 = -2 ⋅ 14 ⋅ a = -28a. Коэффициент: -28.
5. д) -a ⋅ c = -1 ⋅ a ⋅ c = -ac. Коэффициент: -1.
6. e) -x ⋅ (-2) = -1 ⋅ (-2) ⋅ x = 2x. Коэффициент: 2.

Ответ: a) 45; б) 69; в) -45; г) -28; д) -1; e) 2