Вариант А2 1 Выполните действия: a) (4y - 2) · (-2y); б) 5a(a - 2b) + 10ab.

a) (4y − 2) ⋅ (−2y) = 4y ⋅ (−2y) − 2 ⋅ (−2y) = −8y² + 4y

б) 5a(a − 2b) + 10ab = 5a ⋅ a − 5a ⋅ 2b + 10ab = 5a² − 10ab + 10ab = 5a²

Ответ: a) −8y² + 4y; б) 5a²