№1. Выполните умножение: a) 5.2 г) 2 15 6 11 б) 3 1 д) 2 25 1 16 в) 42; e) 13 43 8 26 7

а) 5 \(\cdot 2\frac{1}{5} = 5 \cdot \frac{11}{5} = \frac{5 \cdot 11}{5} = \frac{11}{1} = 11\)

б) \(3\frac{3}{5} \cdot 1\frac{1}{9} = \frac{18}{5} \cdot \frac{10}{9} = \frac{18 \cdot 10}{5 \cdot 9} = \frac{2 \cdot 2}{1 \cdot 1} = 4\)

в) \(4\frac{2}{7} \cdot 2 = \frac{30}{7} \cdot \frac{2}{1} = \frac{30 \cdot 2}{7 \cdot 1} = \frac{60}{7} = 8\frac{4}{7}\)

г) \(2\frac{14}{15} \cdot \frac{6}{11} = \frac{44}{15} \cdot \frac{6}{11} = \frac{44 \cdot 6}{15 \cdot 11} = \frac{4 \cdot 2}{5 \cdot 1} = \frac{8}{5} = 1\frac{3}{5}\)

д) \(2\frac{2}{25} \cdot 1\frac{9}{16} = \frac{52}{25} \cdot \frac{25}{16} = \frac{52 \cdot 25}{25 \cdot 16} = \frac{13 \cdot 1}{1 \cdot 4} = \frac{13}{4} = 3\frac{1}{4}\)

е) \(\frac{13}{43} \cdot \frac{8}{26} = \frac{13 \cdot 8}{43 \cdot 26} = \frac{1 \cdot 4}{43 \cdot 1} = \frac{4}{43}\)