A^2 + 2b/a - a
= (0.2)^2 + 2(4)/0.2 - 0.2
= 0.04 + 8/0.2 - 0.2
= 0.04 + 40 - 0.2
= 39.84

Поэтому, A^2 + 2b/a - a при a=0.2, b=4 равно 39.84.