8. Вычислите.

1. 2^4 + 5^3 = 16 + 125 = 141; 2. (-7)^2 - (-2)^2 = 49 - 4 = 45; 3. 6 * (-5/6)^2 = 6 * (25/36) = 25/6; 4. (-0.4)^2 - (-0.3)^2 = 0.16 - 0.09 = 0.07; 5. (4^4 : 800 + 0.4^2) : (-0.2)^2 = (256 / 800 + 0.16) : 0.04 = (0.32 + 0.16) : 0.04 = 0.48 : 0.04 = 12; 6. (5.9 - 6.1)^3 - (-1.5)^2 = (-0.2)^3 - 2.25 = -0.008 - 2.25 = -2.258.