Конечно, давай решим эти примеры вместе!
1. Тип 2.1 № 591
$$9 \frac{7}{5} - 6 \frac{5}{4} = \frac{52}{5} - \frac{29}{4} = \frac{208 - 145}{20} = \frac{63}{20} = 3 \frac{3}{20}$$
**Ответ: $3 \frac{3}{20}$**
2. Тип 2.1 № 643
$$(\frac{2}{3} + \frac{4}{9}) \cdot \frac{3}{8} = (\frac{6}{9} + \frac{4}{9}) \cdot \frac{3}{8} = \frac{10}{9} \cdot \frac{3}{8} = \frac{10 \cdot 3}{9 \cdot 8} = \frac{30}{72} = \frac{5}{12}$$
**Ответ: $\frac{5}{12}$**
3. Тип 2.1 № 656
$$2 \frac{3}{7} + \frac{3}{8} : \frac{5}{32} = \frac{17}{7} + \frac{3}{8} \cdot \frac{32}{5} = \frac{17}{7} + \frac{3 \cdot 32}{8 \cdot 5} = \frac{17}{7} + \frac{96}{40} = \frac{17}{7} + \frac{12}{5} = \frac{17 \cdot 5 + 12 \cdot 7}{35} = \frac{85 + 84}{35} = \frac{169}{35} = 4 \frac{29}{35}$$
**Ответ: $4 \frac{29}{35}$**
4. Тип 2.1 № 709
$$9 \frac{5}{9} : (\frac{7}{9} + \frac{11}{18}) = \frac{86}{9} : (\frac{14}{18} + \frac{11}{18}) = \frac{86}{9} : \frac{25}{18} = \frac{86}{9} \cdot \frac{18}{25} = \frac{86 \cdot 18}{9 \cdot 25} = \frac{86 \cdot 2}{25} = \frac{172}{25} = 6 \frac{22}{25}$$
**Ответ: $6 \frac{22}{25}$**
5. Тип 2.1 № 722
$$1 - \frac{4}{7} : \frac{16}{21} = 1 - \frac{4}{7} \cdot \frac{21}{16} = 1 - \frac{4 \cdot 21}{7 \cdot 16} = 1 - \frac{84}{112} = 1 - \frac{3}{4} = \frac{4}{4} - \frac{3}{4} = \frac{1}{4}$$
**Ответ: $\frac{1}{4}$**
6. Тип 2.1 № 1689
$$12 \frac{5}{12} : (5 + \frac{1}{3} + 25) = \frac{149}{12} : (30 + \frac{1}{3}) = \frac{149}{12} : \frac{91}{3} = \frac{149}{12} \cdot \frac{3}{91} = \frac{149 \cdot 3}{12 \cdot 91} = \frac{149}{4 \cdot 91} = \frac{149}{364}$$
**Ответ: $\frac{149}{364}$**
7. Тип 2.1 № 1702
$$39 : (\frac{1}{7} + 49) = 39 : (\frac{1}{7} + \frac{49 \cdot 7}{7}) = 39 : (\frac{1 + 343}{7}) = 39 : \frac{344}{7} = 39 \cdot \frac{7}{344} = \frac{39 \cdot 7}{344} = \frac{273}{344}$$
**Ответ: $\frac{273}{344}$**
8. Тип 2.1 № 1792
$$\frac{9}{14} : (\frac{17}{24} - \frac{5}{12}) = \frac{9}{14} : (\frac{17}{24} - \frac{10}{24}) = \frac{9}{14} : \frac{7}{24} = \frac{9}{14} \cdot \frac{24}{7} = \frac{9 \cdot 24}{14 \cdot 7} = \frac{9 \cdot 12}{7 \cdot 7} = \frac{108}{49} = 2 \frac{10}{49}$$
**Ответ: $2 \frac{10}{49}$**
9. Тип 2.1 № 1807
$$16 \frac{3}{5} : (\frac{4}{8} + \frac{4}{15}) = \frac{83}{5} : (\frac{1}{2} + \frac{4}{15}) = \frac{83}{5} : (\frac{15}{30} + \frac{8}{30}) = \frac{83}{5} : \frac{23}{30} = \frac{83}{5} \cdot \frac{30}{23} = \frac{83 \cdot 6}{23} = \frac{498}{23} = 21 \frac{15}{23}$$
**Ответ: $21 \frac{15}{23}$**
10. Тип 2.1 № 1820
$$35 : (\frac{8}{6} + \frac{5}{11}) = 35 : (\frac{4}{3} + \frac{5}{11}) = 35 : (\frac{44}{33} + \frac{15}{33}) = 35 : \frac{59}{33} = 35 \cdot \frac{33}{59} = \frac{35 \cdot 33}{59} = \frac{1155}{59} = 19 \frac{34}{59}$$
**Ответ: $19 \frac{34}{59}$**