Question

Đã trả lời bởi chuyên gia

Answer 1

a) $\frac{2}{9} : x + \frac{5}{6} = 0, 5$

$\frac{2}{9} : x = \frac{1}{2} - \frac{5}{6}$

$\frac{2}{9} : x = \frac{3}{6} - \frac{5}{6}$

$\frac{2}{9} : x = \frac{- 2}{6}$

$x = \frac{2}{9} : \frac{- 2}{6}$

$x = \frac{2}{9} . \frac{6}{- 2}$

$x = \frac{- 2}{3}$

Vậy $x = \frac{- 2}{3}$

b) $\frac{3}{4} - (x - \frac{2}{3}) = 1 \frac{1}{3}$

$\frac{3}{4} - (x - \frac{2}{3}) = \frac{4}{3}$

$x - \frac{2}{3} = \frac{3}{4} - \frac{4}{3}$

$x - \frac{2}{3} = \frac{9}{12} - \frac{16}{12}$

$x - \frac{2}{3} = \frac{- 7}{12}$

$x = \frac{- 7}{12} + \frac{2}{3}$

$x = \frac{- 7}{12} + \frac{8}{12}$

$x = \frac{1}{12}$

Vậy $x = \frac{1}{12}$

c) $1 \frac{1}{4} : (x - \frac{2}{3}) = 0, 75$

$\frac{5}{4} : (x - \frac{2}{3}) = \frac{3}{4}$

$x - \frac{2}{3} = \frac{5}{4} : \frac{3}{4}$

$x - \frac{2}{3} = \frac{5}{4} . \frac{4}{3}$

$x - \frac{2}{3} = \frac{5}{3}$

$x = \frac{5}{3} + \frac{2}{3}$

$x = \frac{7}{3}$

d) $(- \frac{5}{6} x + \frac{5}{4}) : \frac{3}{2} = \frac{4}{3}$

$- \frac{5}{6} x + \frac{5}{4} = \frac{4}{3} . \frac{3}{2}$

$- \frac{5}{6} x + \frac{5}{4} = 2$

$- \frac{5}{6} x = 2 - \frac{5}{4}$

$- \frac{5}{6} x = \frac{8}{4} - \frac{5}{4}$

$- \frac{5}{6} x = \frac{3}{4}$

$x = \frac{3}{4} : (- \frac{5}{6})$

$x = \frac{3}{4} . \frac{- 6}{5}$

$x = \frac{- 9}{10}$

Vậy $x = \frac{- 9}{10}$

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Answer 2