1. Выполните умножение. 23 1) a) - 57 35 6) - 4 11 2 11 в) - 97 4 6 г) - 5 19 2) a) 5 7 7 13 4 1 6) - 94 38 B) - 8 13 37 г) - 711 6 15 3) a) 25 17 14 4 6) - 15 21 24 7 B) 25 36 5 16 г) 24 17

Давай выполним умножение дробей.

1) a) \[\frac{2}{5} \cdot \frac{3}{7} = \frac{2 \cdot 3}{5 \cdot 7} = \frac{6}{35}\]

б) \[\frac{3}{4} \cdot \frac{5}{11} = \frac{3 \cdot 5}{4 \cdot 11} = \frac{15}{44}\]

в) \[\frac{2}{9} \cdot \frac{11}{7} = \frac{2 \cdot 11}{9 \cdot 7} = \frac{22}{63}\]

г) \[\frac{4}{5} \cdot \frac{6}{19} = \frac{4 \cdot 6}{5 \cdot 19} = \frac{24}{95}\]

2) a) \[\frac{5}{7} \cdot \frac{7}{13} = \frac{5 \cdot 7}{7 \cdot 13} = \frac{35}{91}\]

б) \[\frac{4}{9} \cdot \frac{1}{4} = \frac{4 \cdot 1}{9 \cdot 4} = \frac{4}{36} = \frac{1}{9}\]

в) \[\frac{3}{8} \cdot \frac{8}{13} = \frac{3 \cdot 8}{8 \cdot 13} = \frac{24}{104} = \frac{3}{13}\]

г) \[\frac{3}{7} \cdot \frac{7}{11} = \frac{3 \cdot 7}{7 \cdot 11} = \frac{21}{77} = \frac{3}{11}\]

3) a) \[\frac{6}{25} \cdot \frac{15}{17} = \frac{6 \cdot 15}{25 \cdot 17} = \frac{90}{425} = \frac{18}{85}\]

б) \[\frac{14}{15} \cdot \frac{4}{21} = \frac{14 \cdot 4}{15 \cdot 21} = \frac{56}{315} = \frac{8}{45}\]

в) \[\frac{24}{25} \cdot \frac{7}{36} = \frac{24 \cdot 7}{25 \cdot 36} = \frac{168}{900} = \frac{14}{75}\]

г) \[\frac{5}{24} \cdot \frac{16}{17} = \frac{5 \cdot 16}{24 \cdot 17} = \frac{80}{408} = \frac{10}{51}\]