номер 937 938 решите пж. Дам лучший ответ и спасибо!

номер 937 938 решите пж. Дам лучший ответ и спасибо!
- Предмет:
  Математика
- Автор:
  arthurifjd
- 6 лет назад

Ответы 2

чтоор?
- Автор:
  anabella
- 6 лет назад
- 0
937. а) $(\frac{1}{2}:\frac{3}{4}-\frac{4}{9}):\frac{3}{5}$ = $(\frac{1}{2}*\frac{4}{3}-\frac{4}{9})*\frac{5}{3}$ = $(\frac{2}{3}-\frac{4}{9})*\frac{5}{3}$ = $(\frac{6}{9}-\frac{4}{9})*\frac{5}{3}$ = $\frac{2}{9}*\frac{5}{3}$ = $\frac{10}{27};$ б) $\frac{1}{2}:\frac{3}{8}-\frac{4}{9}:\frac{3}{5}$ = $\frac{1}{2}*\frac{8}{3}-\frac{4}{9}*\frac{5}{3}$ = $\frac{4}{3}-\frac{20}{27}$ = $\frac{36}{27}-\frac{20}{27}$ = $\frac{16}{27};$ в) $\frac{3}{5}:(\frac{9}{10}-\frac{3}{5}*\frac{8}{9})$ = $\frac{3}{5}:(\frac{9}{10}-\frac{1}{5}*\frac{8}{3})$ = $\frac{3}{5}:(\frac{9}{10}-\frac{8}{15})$ = $\frac{3}{5}:(\frac{27}{30}-\frac{16}{30})$ = $\frac{3}{5}:\frac{11}{30}$ = $\frac{3}{5}*\frac{30}{11}$ = $\frac{3}{1}*\frac{6}{11}$ = $\frac{18}{11}$ = $1\frac{7}{11};$ г) $\frac{3}{5}:\frac{9}{10}-\frac{3}{5}*\frac{8}{9}$ = $\frac{3}{5}*\frac{10}{9}-\frac{3}{5}*\frac{8}{9}$ = $\frac{3}{5}(\frac{10}{9}-\frac{8}{9})$ = $\frac{3}{5}*\frac{2}{9}$ = $\frac{1}{5}*\frac{2}{3}$ = $\frac{2}{15}.$ 938.а) $4*\frac{1}{5}+4*\frac{3}{7}-4*\frac{1}{35}$ = $4(\frac{1}{5}+\frac{3}{7}-\frac{1}{35})$ = $4(\frac{7}{35}+\frac{15}{35}-\frac{1}{35})$ = $4*\frac{21}{35}$ = $4*\frac{21:7}{35:7}$ = $4*\frac{3}{5}$ = $\frac{12}{5}$ = $2\frac{2}{5};$ б) $\frac{3}{8}*5+\frac{5}{56}-\frac{1}{7}:\frac{1}{5}$ = $\frac{3}{8}*5+\frac{5}{56}-\frac{1}{7}*5$ = $5(\frac{3}{8}-\frac{1}{7})+\frac{5}{56}$ = $5(\frac{21}{56}-\frac{8}{56})+\frac{5}{56}$ = $5*\frac{13}{56}+\frac{5}{56}$ = $\frac{65}{56}+\frac{5}{56}$ = $\frac{70}{56}$ = $1\frac{14}{56}$ = $1\frac{1}{4};$ в) $\frac{3}{2}*\frac{5}{6}+\frac{3}{2}:\frac{9}{10}-\frac{3}{2}*\frac{13}{18}$ = $\frac{3}{2}*\frac{5}{6}+\frac{3}{2}*\frac{10}{9}-\frac{3}{2}*\frac{13}{18}$ = $\frac{3}{2}(\frac{5}{6}+\frac{10}{9}-\frac{13}{18})$ = $\frac{3}{2}(\frac{15}{18}+\frac{20}{18}-\frac{13}{18})$ = $\frac{3}{2}*\frac{22}{18}$ = $\frac{3}{1}*\frac{11}{18}$ = $\frac{1}{1}*\frac{11}{6}$ = $\frac{11}{6}$ = $1\frac{5}{6};$ г) $\frac{4}{5}:\frac{5}{8}-\frac{4}{5}*\frac{24}{25}+\frac{1}{25}:\frac{5}{4}$ = $\frac{4}{5}*\frac{8}{5}-\frac{4}{5}*\frac{24}{25}+\frac{1}{25}*\frac{4}{5}$ = $\frac{4}{5}(\frac{8}{5}-\frac{24}{25}+\frac{1}{25})$ = $\frac{4}{5}(\frac{40}{25}-\frac{24}{25}+\frac{1}{25})$ = $\frac{4}{5}*\frac{17}{25}$ = $\frac{68}{125}.$
- Автор:
  isisgates
- 6 лет назад
- 0
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