д) $$4\frac{9}{16} - 2\frac{3}{14} = 4\frac{9\cdot7}{16\cdot7} - 2\frac{3\cdot8}{14\cdot8} = 4\frac{63}{112} - 2\frac{24}{112} = (4-2) + (\frac{63}{112} - \frac{24}{112}) = 2 + \frac{39}{112} = 2\frac{39}{112}$$
Ответ: $$2\frac{39}{112}$$