1. 3
2. 12
Объяснение:
(а–3)²–2(а–3)= (2–3)²–2(2–3) = (-1)²–2(-1)= 1+2=3
(5а–7)+(5а–7)²= (5*2–7)+(5*2–7)²= (10–7)+(10–7)²= 3+3²= 3+9= 12
