а) 1) \frac{15}{6} = 2 \frac{3}{6} = 2 \frac{1}{2}.
2) \frac{39}{12} = 3 \frac{3}{12} = 3 \frac{1}{4}.
б) 1) 2 \frac{5}{9} = \frac{2 * 9 + 5}{9} = \frac{18 + 5}{9} = \frac{23}{9}.
2) 3 \frac{4}{16} = \frac{3 * 16 + 4}{16} = \frac{48 + 4}{16} = \frac{52}{16} = \frac{13}{4}.