Đáp án+giải thích các bước giải:
$\dfrac{7}{9}:\dfrac{x}{y}-\dfrac{11}{18} = \dfrac{4}{3}$
$\dfrac{7}{9}.\dfrac{y}{x}-\dfrac{11}{18} = \dfrac{4}{3}$
$\dfrac{7}{9}.\dfrac{y}{x} = \dfrac{4}{3}+\dfrac{11}{18}$
$\dfrac{7}{9}.\dfrac{y}{x} = \dfrac{35}{18}$
$\dfrac{y}{x} = \dfrac{35}{18} : \dfrac{7}{9}$
$\dfrac{y}{x} = \dfrac{5}{2}$
$⇒\dfrac{x}{y} = \dfrac{2}{5}$
Vậy $\dfrac{x}{y} = \dfrac{2}{5}$
