Question

Đã trả lời bởi chuyên gia

Answer 1

a)

$\frac{-3}{25} \times \frac{4}{17} \times \frac{5}{-3} \times \frac{17}{2}$

$= \frac{- 3 \times 4 \times 5 \times 17}{25 \times 17 \times (- 3) \times 2} = \frac{- 3 \times 2 \times 2 \times 5 \times 17}{5 \times 5 \times 17 \times (- 3) \times 2} = \frac{2}{5}$

b)

$\frac{-8}{15} \times \frac{13}{16} \div \frac{13}{30}$

$= \frac{- 8}{15} \times \frac{13}{16} \times \frac{30}{13} = \frac{- 1 \times 8 \times 13 \times 15 \times 2}{15 \times 2 \times 8 \times 13} = - 1$

c)

$\frac{3}{11} \times \frac{2}{9} + \frac{-8}{33} + \frac{3}{11} \times \frac{7}{9}$

$= (\frac{3}{11} \times \frac{2}{9} + \frac{3}{11} \times \frac{7}{9}) - \frac{8}{33} = \frac{3}{11} \times (\frac{2}{9} + \frac{7}{9}) - \frac{8}{33} = \frac{3}{11} \times \frac{9}{9} - \frac{8}{33} = \frac{3}{11} - \frac{8}{33} = \frac{9}{33} - \frac{8}{33} = \frac{1}{33}$

d)

$\frac{-11}{25} \times \frac{2}{3} - \frac{-1}{6} + \frac{-2}{3} \times \frac{14}{25}$

$= \frac{- 11}{25} \times \frac{2}{3} - \frac{2}{3} \times \frac{14}{25} + \frac{1}{6} = \frac{2}{3} \times (\frac{- 11}{25} - \frac{14}{25}) + \frac{1}{6} = \frac{2}{3} \times (- 1) + \frac{1}{6} = \frac{- 2}{3} + \frac{1}{6} = \frac{- 4}{6} + \frac{1}{6} = \frac{- 3}{6} = \frac{- 1}{2}$

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Answer 2

a)