Выполни действия: 13 : 3 1/4

Конечно, давай решим эти примеры вместе! 13) $13 : 3\frac{1}{4} = 13 : \frac{13}{4} = 13 \cdot \frac{4}{13} = \frac{13 \cdot 4}{13} = \frac{4}{1} = 4$ 14) $\frac{13}{72} \cdot \frac{18}{23} = \frac{13 \cdot 18}{72 \cdot 23} = \frac{13 \cdot 1}{4 \cdot 23} = \frac{13}{92}$ 15) $6\frac{2}{7} : 3 = \frac{44}{7} : 3 = \frac{44}{7} \cdot \frac{1}{3} = \frac{44}{21} = 2\frac{2}{21}$ 16) $\frac{8}{45} \cdot 8\frac{3}{4} = \frac{8}{45} \cdot \frac{35}{4} = \frac{8 \cdot 35}{45 \cdot 4} = \frac{2 \cdot 7}{9 \cdot 1} = \frac{14}{9} = 1\frac{5}{9}$ 17) $\frac{9}{16} : 1\frac{5}{28} = \frac{9}{16} : \frac{33}{28} = \frac{9}{16} \cdot \frac{28}{33} = \frac{9 \cdot 28}{16 \cdot 33} = \frac{3 \cdot 7}{4 \cdot 11} = \frac{21}{44}$ 18) $\frac{3}{14} \cdot 21 = \frac{3 \cdot 21}{14} = \frac{3 \cdot 3}{2} = \frac{9}{2} = 4\frac{1}{2}$ 19) $4\frac{1}{4} \cdot 1\frac{40}{51} = \frac{17}{4} \cdot \frac{91}{51} = \frac{17 \cdot 91}{4 \cdot 51} = \frac{1 \cdot 91}{4 \cdot 3} = \frac{91}{12} = 7\frac{7}{12}$ 20) $\frac{4}{5} : \frac{7}{11} = \frac{4}{5} \cdot \frac{11}{7} = \frac{4 \cdot 11}{5 \cdot 7} = \frac{44}{35} = 1\frac{9}{35}$ 21) $2\frac{1}{3} \cdot 1\frac{5}{9} = \frac{7}{3} \cdot \frac{14}{9} = \frac{7 \cdot 14}{3 \cdot 9} = \frac{98}{27} = 3\frac{17}{27}$ 22) $\frac{7}{12} : 6 = \frac{7}{12} \cdot \frac{1}{6} = \frac{7}{72}$ 23) $99 \cdot 1\frac{2}{33} = 99 \cdot \frac{35}{33} = \frac{99 \cdot 35}{33} = \frac{3 \cdot 35}{1} = 105$ 24) $4\frac{1}{6} : 16\frac{2}{3} = \frac{25}{6} : \frac{50}{3} = \frac{25}{6} \cdot \frac{3}{50} = \frac{25 \cdot 3}{6 \cdot 50} = \frac{1 \cdot 1}{2 \cdot 2} = \frac{1}{4}$