б) 1 2/3 - (-0,75)

1. Convert mixed number and decimal to fractions: 1 2/3 = 5/3, -0.75 = -3/4.
2. Rewrite the expression: 5/3 - (-3/4) = 5/3 + 3/4.
3. Add the fractions: 5/3 + 3/4 = (20 + 9) / 12 = 29/12.