1. Выполните действия.

Привет! Давай решим примеры с дробями. 1) $\frac{6}{49} \cdot 14 = \frac{6 \cdot 14}{49} = \frac{6 \cdot 2}{7} = \frac{12}{7} = 1\frac{5}{7}$ 2) $\frac{1}{2} : \frac{5}{6} = \frac{1}{2} \cdot \frac{6}{5} = \frac{1 \cdot 3}{1 \cdot 5} = \frac{3}{5}$ 3) $\frac{7}{15} \cdot \frac{5}{7} = \frac{1 \cdot 1}{3 \cdot 1} = \frac{1}{3}$ 4) $10 : \frac{4}{5} = 10 \cdot \frac{5}{4} = \frac{5 \cdot 5}{2} = \frac{25}{2} = 12\frac{1}{2}$ 5) $\frac{3}{8} \cdot \frac{7}{11} = \frac{21}{88}$ 6) $8 \cdot \frac{17}{64} = \frac{1 \cdot 17}{8} = \frac{17}{8} = 2\frac{1}{8}$ 7) $3\frac{5}{7} : \frac{13}{14} = \frac{26}{7} \cdot \frac{14}{13} = \frac{2 \cdot 2}{1 \cdot 1} = 4$ 8) $1\frac{2}{9} \cdot 1\frac{5}{22} = \frac{11}{9} \cdot \frac{27}{22} = \frac{1}{1} \cdot \frac{3}{2} = \frac{3}{2} = 1\frac{1}{2}$ 9) $38 : 2\frac{3}{8} = 38 : \frac{19}{8} = 38 \cdot \frac{8}{19} = 2 \cdot 8 = 16$ 10) $2\frac{3}{8} \cdot 2 = \frac{19}{8} \cdot 2 = \frac{19}{4} = 4\frac{3}{4}$ 11) $5\frac{1}{4} : 56 = \frac{21}{4} : 56 = \frac{21}{4 \cdot 56} = \frac{3}{4 \cdot 8} = \frac{3}{32}$ 12) $5\frac{4}{7} : 7\frac{1}{8} = \frac{39}{7} : \frac{57}{8} = \frac{39}{7} \cdot \frac{8}{57} = \frac{13 \cdot 8}{7 \cdot 19} = \frac{104}{133}$