Вопрос:
2. Найдите значение выражения.
а) \(\frac{5}{18} \cdot \frac{1}{2}\)
б) \(\frac{21}{25} \cdot \frac{15}{18}\)
в) \(\frac{38}{5} \cdot \frac{10}{9}\)
г) \(\frac{25}{36} \cdot \frac{27}{50}\)
д) \(\frac{3}{10} \cdot \frac{25}{27}\)
е) \(\frac{12}{25} \cdot \frac{5}{8}\)
ж) \(\frac{14}{25} \cdot \frac{15}{21}\)
3) \(\frac{13}{102} \cdot \frac{17}{78}\)
и) \(\frac{19}{450} \cdot \frac{150}{114}\)
к) \(\frac{61}{252} \cdot \frac{12}{305}\)
л) \(\frac{71}{100} \cdot \frac{25}{142}\)
м) \(\frac{27}{52} \cdot \frac{26}{9}\)
Ответ:
2. Найдите значение выражения.
- а) \(\frac{5}{18} \cdot \frac{1}{2} = \frac{5 \cdot 1}{18 \cdot 2} = \frac{5}{36}\)
- б) \(\frac{21}{25} \cdot \frac{15}{18} = \frac{21 \cdot 15}{25 \cdot 18} = \frac{3 \cdot 7 \cdot 3 \cdot 5}{5 \cdot 5 \cdot 2 \cdot 3 \cdot 3} = \frac{7}{10}\)
- в) \(\frac{38}{5} \cdot \frac{10}{9} = \frac{38 \cdot 10}{5 \cdot 9} = \frac{38 \cdot 2}{9} = \frac{76}{9}\)
- г) \(\frac{25}{36} \cdot \frac{27}{50} = \frac{25 \cdot 27}{36 \cdot 50} = \frac{1 \cdot 3}{4 \cdot 2} = \frac{3}{8}\)
- д) \(\frac{3}{10} \cdot \frac{25}{27} = \frac{3 \cdot 25}{10 \cdot 27} = \frac{1 \cdot 5}{2 \cdot 9} = \frac{5}{18}\)
- е) \(\frac{12}{25} \cdot \frac{5}{8} = \frac{12 \cdot 5}{25 \cdot 8} = \frac{3 \cdot 1}{5 \cdot 2} = \frac{3}{10}\)
- ж) \(\frac{14}{25} \cdot \frac{15}{21} = \frac{14 \cdot 15}{25 \cdot 21} = \frac{2 \cdot 3}{5 \cdot 3} = \frac{2}{5}\)
- з) \(\frac{13}{102} \cdot \frac{17}{78} = \frac{13 \cdot 17}{102 \cdot 78} = \frac{13 \cdot 1}{6 \cdot 78} = \frac{13}{468} = \frac{1}{36}\)
- и) \(\frac{19}{450} \cdot \frac{150}{114} = \frac{19 \cdot 150}{450 \cdot 114} = \frac{19 \cdot 1}{3 \cdot 114} = \frac{19}{342} = \frac{1}{18}\)
- к) \(\frac{61}{252} \cdot \frac{12}{305} = \frac{61 \cdot 12}{252 \cdot 305} = \frac{61 \cdot 1}{21 \cdot 305} = \frac{61}{6405}\)
- л) \(\frac{71}{100} \cdot \frac{25}{142} = \frac{71 \cdot 25}{100 \cdot 142} = \frac{1 \cdot 1}{4 \cdot 2} = \frac{1}{8}\)
- м) \(\frac{27}{52} \cdot \frac{26}{9} = \frac{27 \cdot 26}{52 \cdot 9} = \frac{3 \cdot 1}{2 \cdot 1} = \frac{3}{2}\)