Реши пример 1 на умножение: 64 * 7/12

Конечно, давай решим эти примеры! Сейчас я покажу тебе, как это делается. **Умножение** 1) $64 \cdot \frac{7}{12} = \frac{64 \cdot 7}{12} = \frac{448}{12} = \frac{112}{3} = 37\frac{1}{3}$ 2) $7\frac{8}{11} \cdot 2\frac{1}{5} = \frac{85}{11} \cdot \frac{11}{5} = \frac{85 \cdot 11}{11 \cdot 5} = \frac{85}{5} = 17$ 3) $\frac{9}{13} \cdot 91 = \frac{9 \cdot 91}{13} = \frac{9 \cdot 7 \cdot 13}{13} = 9 \cdot 7 = 63$ 4) $\frac{1}{15} \cdot \frac{4}{5} = \frac{1 \cdot 4}{15 \cdot 5} = \frac{4}{75}$ 5) $5\frac{7}{20} \cdot \frac{1}{2} = \frac{107}{20} \cdot \frac{1}{2} = \frac{107 \cdot 1}{20 \cdot 2} = \frac{107}{40} = 2\frac{27}{40}$ 6) $3\frac{13}{21} \cdot 28 = \frac{76}{21} \cdot 28 = \frac{76 \cdot 28}{21} = \frac{76 \cdot 4 \cdot 7}{3 \cdot 7} = \frac{304}{3} = 101\frac{1}{3}$ 7) $1\frac{5}{26} \cdot 1\frac{1}{3} = \frac{31}{26} \cdot \frac{4}{3} = \frac{31 \cdot 4}{26 \cdot 3} = \frac{31 \cdot 2}{13 \cdot 3} = \frac{62}{39} = 1\frac{23}{39}$ 8) $16 \cdot 5\frac{3}{4} = 16 \cdot \frac{23}{4} = \frac{16 \cdot 23}{4} = \frac{4 \cdot 4 \cdot 23}{4} = 4 \cdot 23 = 92$ **Деление** 1) $3\frac{3}{8} : 1\frac{1}{2} = \frac{27}{8} : \frac{3}{2} = \frac{27}{8} \cdot \frac{2}{3} = \frac{27 \cdot 2}{8 \cdot 3} = \frac{9 \cdot 3 \cdot 2}{4 \cdot 2 \cdot 3} = \frac{9}{4} = 2\frac{1}{4}$ 2) $\frac{5}{13} : 4\frac{1}{2} = \frac{5}{13} : \frac{9}{2} = \frac{5}{13} \cdot \frac{2}{9} = \frac{5 \cdot 2}{13 \cdot 9} = \frac{10}{117}$ 3) $2\frac{2}{5} : \frac{11}{13} = \frac{12}{5} : \frac{11}{13} = \frac{12}{5} \cdot \frac{13}{11} = \frac{12 \cdot 13}{5 \cdot 11} = \frac{156}{55} = 2\frac{46}{55}$ 4) $76 : 20 = \frac{76}{20} = \frac{38}{10} = 3,8$ 5) $14 : \frac{3}{11} = \frac{14}{1} : \frac{3}{11} = \frac{14}{1} \cdot \frac{11}{3} = \frac{14 \cdot 11}{1 \cdot 3} = \frac{154}{3} = 51\frac{1}{3}$ 6) $16\frac{8}{9} : 1\frac{13}{63} = \frac{152}{9} : \frac{76}{63} = \frac{152}{9} \cdot \frac{63}{76} = \frac{152 \cdot 63}{9 \cdot 76} = \frac{2 \cdot 76 \cdot 7 \cdot 9}{9 \cdot 76} = 2 \cdot 7 = 14$ 7) $7\frac{3}{7} : \frac{1}{14} = \frac{52}{7} : \frac{1}{14} = \frac{52}{7} \cdot \frac{14}{1} = \frac{52 \cdot 14}{7 \cdot 1} = \frac{52 \cdot 2 \cdot 7}{7} = 52 \cdot 2 = 104$ 8) $9\frac{5}{9} : 15 = \frac{86}{9} : \frac{15}{1} = \frac{86}{9} \cdot \frac{1}{15} = \frac{86 \cdot 1}{9 \cdot 15} = \frac{86}{135}$