a) 0,1(6) = (16 - 1)/90 = 15/90 = 3/18 = 1/6
[0,1(6)]^2 = 1/36
b) -0,8(3) = -(83 -8)/90 = -75/90 = -15/18 = -5/6
[-0,8(3)]^2 = 25/36
c) [0,2(6)]^2 = [(26 - 2)/90]^2 = (24/90)^2 = (4/15)^2 = 16/225
d) (-2/3)^3 = 8/27
e) [(13 -1)/9]^3 = (4/3)^3 = 64/27
f) [-(16 - 1)/9]^3 = (-5/3)^3 = - 125/27