в) -2,4 - 1,75 - (-5/12)

1. Convert decimals to fractions: -2.4 = -24/10 = -12/5, -1.75 = -175/100 = -7/4.
2. Rewrite the expression: -12/5 - (-7/4) - (-5/12) = -12/5 + 7/4 + 5/12.
3. Find a common denominator (60) and add: (-144 + 105 + 25) / 60 = -14/60 = -7/30.