10.

1. -y(y - 8) + (y + 3)^2 при y = 1/2: -(1/2)(1/2 - 8) + (1/2 + 3)^2 = -(1/2)(-15/2) + (7/2)^2 = 15/4 + 49/4 = 64/4 = 16.

2. (n + 6)^2 + (2 - n)(2 + n) при n = -5/12: (-5/12 + 6)^2 + (2 - (-5/12))(2 + (-5/12)) = (67/12)^2 + (29/12)(19/12) = 4489/144 + 551/144 = 5040/144 = 35.

3. -(2 - c)^2 - 4(2 - c) при c = 0,2: -(2 - 0,2)^2 - 4(2 - 0,2) = -(1,8)^2 - 4(1,8) = -3,24 - 7,2 = -10,44.

4. (b + 5)^2 - b^2 - 5 при b = 9/10: (9/10 + 5)^2 - (9/10)^2 - 5 = (59/10)^2 - 81/100 - 5 = 3481/100 - 81/100 - 500/100 = (3481 - 81 - 500)/100 = 2900/100 = 29.