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1) $\frac{38}{9} + \frac{17}{3} - \frac{13}{9} = \frac{38}{9} + \frac{51}{9} = \frac{89}{9} - \frac{13}{9} = \frac{76}{9} = 8,4$

НОЗ: 9.

2) $9 - \frac{70}{17} + \frac{37}{17} = -\frac{70}{17} + \frac{37}{17} = \frac{107}{17} = 9 - 6,29 = 2,71$

3) $\frac{28}{5} - \frac{28}{11} + \frac{18}{5} = \frac{308}{55} - \frac{140}{55} = \frac{168}{55} + \frac{198}{55} = \frac{366}{55} = 6\frac{36}{55}$

НОЗ: 55.

4) $\frac{35}{8} + \frac{31}{8} - \frac{10}{7} = \frac{66}{8} - \frac{10}{7} = \frac{462}{56} - \frac{80}{56} = \frac{382}{56} = 6\frac{46}{56}$

НОЗ: 56.

5) 20 - $\frac{53}{15} + \frac{154}{15} = \frac{207}{15} = 20 - 13,8 = 6,2$

6) 30 - $\frac{159}{10} - \frac{123}{10} = \frac{36}{10} = 30 - 3,6 = 26,4$

7) $\frac{172}{11} - \frac{73}{16} + \frac{37}{11} = \frac{2752}{176} - \frac{803}{176} = \frac{1949}{176} + \frac{37}{11} = \frac{1949}{176} + \frac{592}{176} = \frac{2541}{176} = 14,4375$

НОЗ: 176.

8) 49 - $\frac{98}{5} - \frac{12}{5} = \frac{86}{5} = 49 - 17,2 = 31,8$

9) $\frac{160}{13} - \frac{53}{20} + \frac{48}{13} = \frac{3200}{260} - \frac{689}{260} = \frac{2511}{260} + \frac{48}{13} = \frac{2511}{260} + \frac{960}{260} = \frac{3471}{260} = 13,35$

НОЗ: 260.

10) $\frac{504}{17} - \frac{101}{24} + \frac{176}{17} = \frac{12096}{408} + \frac{1717}{408} = \frac{13813}{408} = 33,85$

НОЗ: 408.