1. 9 + 6 2/6 + 4 4/9 = 2. 15 3/7 - 9 4/10 = 3 .4 4/8 :2 1/2 =

1.
9 + 6 2/6 + 4 4/9
= 9 + 38/6 + 40/9
= 162/18 + 114/18 + 80/18
= 356/18
= 19 14/18
= 19 7/9

2.
15 3/7 - 9 4/10
= 108/7 - 94/10
= 1080/70 - 658/70
= 422/70
= 6 2/70
= 6 1/35

3.
4 4/8 : 2 1/2
= 36/8 : 5/2
= 36/8 × 2/5
= 72/40
= 1 32/40
= 1 4/5


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[tex]1) \: 9 + 6 \frac{2}{6} + 4 \frac{4}{9} \\ = \frac{9}{1} + \frac{38}{6} + \frac{40}{9} \\ = \frac{162}{18} + \frac{114}{18} + \frac{80}{18} \\ = \frac{356}{18} \\ = 19 \frac{14}{18} \\ = 19 \frac{7}{9} [/tex]


[tex]2) \: 15 \frac{3}{7} - 9 \frac{4}{10} \\ = \frac{108}{7} - \frac{94}{10} \\ = \frac{1.080}{70} - \frac{658}{70} \\ = \frac{432}{70} \\ = 6 \frac{2}{70} \\ = 6 \frac{1}{35} [/tex]

[tex]3) \: 4 \frac{4}{8} \div 2 \frac{1}{2} \\ = \frac{36}{8} \div \frac{5}{2} \\ = \frac{36}{8} \times \frac{2}{5} \\ = \frac{72}{40} \\ = 1 \frac{32}{40} \\ = 1 \frac{4}{5} [/tex]