в) -2,4 - 1,75 - (-$$\frac{5}{12}$$) = -2,4 - 1,75 + $$\frac{5}{12}$$ = -4,15 + $$\frac{5}{12}$$ = -4$$\frac{15}{100}$$ + $$\frac{5}{12}$$ = -4$$\frac{3}{20}$$ + $$\frac{5}{12}$$ = -4$$\frac{9}{60}$$ + $$\frac{25}{60}$$ = -4$$\frac{9}{60}$$ + $$\frac{25}{60}$$ = -4 + $$\frac{16}{60}$$ = -4 + $$\frac{4}{15}$$ = -3$$\frac{15}{15}$$ + $$\frac{4}{15}$$ = -3$$\frac{11}{15}$$
Ответ: -3$$\frac{11}{15}$$