(a²-0.45a+1.2)+(0.8a²-1.2a)-(1.6a²-2a) =
= a²-0.45a+1.2 + 0.8a²-1.2a - 1.6a² + 2a =
= 0,2а² +0,35а +1,2
(a²-0.45a+1.2)+(0.8a²-1.2a)-(1.6a²-2a) =
= a²-0.45a+1.2 + 0.8a²-1.2a - 1.6a² + 2a =
= 0,2а² +0,35а +1,2