Ответ: (Решения представлены ниже)
Краткое пояснение: Решаем примеры на умножение и деление дробей, а также уравнения.
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а) \(10:\frac{2}{5} = 10 \cdot \frac{5}{2} = \frac{10 \cdot 5}{2} = \frac{50}{2} = 25\); б) \(21:\frac{3}{7} = 21 \cdot \frac{7}{3} = \frac{21 \cdot 7}{3} = \frac{147}{3} = 49\); в) \(8:\frac{1}{4} = 8 \cdot \frac{4}{1} = \frac{8 \cdot 4}{1} = 32\); г) \(15:\frac{5}{9} = 15 \cdot \frac{9}{5} = \frac{15 \cdot 9}{5} = \frac{135}{5} = 27\);
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а) \(1\frac{1}{3}: \frac{5}{8} = \frac{4}{3} : \frac{5}{8} = \frac{4}{3} \cdot \frac{8}{5} = \frac{4 \cdot 8}{3 \cdot 5} = \frac{32}{15} = 2\frac{2}{15}\); б) \(4\frac{1}{2} : 6 = \frac{9}{2} : 6 = \frac{9}{2} \cdot \frac{1}{6} = \frac{9 \cdot 1}{2 \cdot 6} = \frac{9}{12} = \frac{3}{4}\); в) \(10:\frac{1}{5} = \frac{51}{5} \cdot \frac{5}{1} = \frac{51 \cdot 5}{5} = 51\); г) \(2\frac{3}{13} : 8 = \frac{29}{13} : 8 = \frac{29}{13} \cdot \frac{1}{8} = \frac{29 \cdot 1}{13 \cdot 8} = \frac{29}{104}\);
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а) \(x \cdot 2 = \frac{6}{7}\); \(x = \frac{6}{7} : 2\); \(x = \frac{6}{7} \cdot \frac{1}{2}\); \(x = \frac{6}{14} = \frac{3}{7}\); б) \(\frac{4}{7} \cdot x = \frac{5}{6}\); \(x = \frac{5}{6} : \frac{4}{7}\); \(x = \frac{5}{6} \cdot \frac{7}{4}\); \(x = \frac{35}{24} = 1\frac{11}{24}\); в) \(x \cdot \frac{1}{3} = \frac{2}{5}\); \(x = \frac{2}{5} : \frac{1}{3}\); \(x = \frac{2}{5} \cdot 3\); \(x = \frac{6}{5} = 1\frac{1}{5}\); г) \(\frac{3}{4} \cdot x = 0\); \(x = 0 : \frac{3}{4}\); \(x = 0\);
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а) \(x:3 = \frac{1}{6}\); \(x = \frac{1}{6} \cdot 3\); \(x = \frac{3}{6} = \frac{1}{2}\); б) \(\frac{1}{2} : x = \frac{1}{4}\); \(x = \frac{1}{2} : \frac{1}{4}\); \(x = \frac{1}{2} \cdot 4\); \(x = 2\); в) \(\frac{1}{2} : x = 4\); \(x = \frac{1}{2} : 4\); \(x = \frac{1}{2} \cdot \frac{1}{4}\); \(x = \frac{1}{8}\); г) \(\frac{1}{3} : x = 3\); \(x = \frac{1}{3} : 3\); \(x = \frac{1}{3} \cdot \frac{1}{3}\); \(x = \frac{1}{9}\);
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а) \(2\frac{1}{3} - \frac{1}{3} = \frac{7}{3} - \frac{1}{3} = \frac{6}{3} = 2\); б) \(1\frac{1}{6} + 1\frac{2}{3} = 1\frac{1}{6} + 1\frac{4}{6} = 2\frac{5}{6}\); в) \(1\frac{1}{4} - \frac{2}{5} = \frac{5}{4} - \frac{2}{5} = \frac{25}{20} - \frac{8}{20} = \frac{17}{20}\); г) \(1\frac{3}{8} : 4 = \frac{11}{8} : 4 = \frac{11}{8} \cdot \frac{1}{4} = \frac{11}{32}\); д) \(8:1\frac{7}{9} = 8 : \frac{16}{9} = 8 \cdot \frac{9}{16} = \frac{72}{16} = \frac{9}{2} = 4\frac{1}{2}\); е) \(3\frac{1}{2} : 1\frac{1}{6} = \frac{7}{2} : \frac{7}{6} = \frac{7}{2} \cdot \frac{6}{7} = \frac{42}{14} = 3\);
Ответ: (Решения представлены выше)