exxxxxxxxx 2 REPEDEEEE PLS

a) 2⁻³ = 1/2³ = 1/8
b) 1,(3) = (1×9+3)/9 = 12/9 = simplificam cu 3 = 4/3
c) (-2)³ - 28:4 = - 8 - 7 = - 15