359. Найдите значение выражений.

a) 0.5 * √121 + 3 * √0.81 = 0.5 * 11 + 3 * 0.9 = 5.5 + 2.7 = 8.2. b) (-3√(1/3))^2 - 10√0.64 = (-3 * √(1/3))^2 - 10 * 0.8 = 3^2 * 1/3 - 8 = 9/3 - 8 = 3 - 8 = -5. c) √400 - (4√0.5)^2 = 20 - 16 * 0.5 = 20 - 8 = 12.