Ответ:

1)32

2)36

3)72

Пошаговое объяснение:

[tex] \frac{3}{4} + \frac{5}{8} + \frac{17}{32} = \frac{21 + 20 + 17}{32} = \frac{58}{32} = \frac{29}{16} [/tex]

[tex] \frac{5}{ 6} + \frac{7}{9} + \frac{15}{36} = \frac{30 + 28 + 15}{36} = \frac{73}{36} [/tex]

[tex] \frac{7}{72} + \frac{2}{9} + \frac{3}{8} = \frac{7 + 16 + 27}{72} = \frac{50}{72} = \frac{25}{36} [/tex]