Question

1) \(\dfrac{x}{\dfrac{-5}{9}}\)= \(\dfrac{\dfrac{4}{3}}{\dfrac{-2}{5}}\)

2) \(\dfrac{7}{\dfrac{5}{3x}}\)= \(\dfrac{-\dfrac{4}{9}}{\dfrac{5}{6}}\)

Answer 1

a/ \(\dfrac{x}{-\dfrac{5}{9}}=\dfrac{\dfrac{4}{3}}{-\dfrac{2}{5}}\)

\(\Leftrightarrow x.\left(\dfrac{-2}{5}\right)=\left(\dfrac{-5}{9}\right).\dfrac{4}{3}\)

\(\Leftrightarrow x.\left(-\dfrac{2}{5}\right)=\dfrac{-20}{27}\)

\(\Leftrightarrow x=\)\(\dfrac{-54}{100}\)

b/ tương tự

Answer 2

b, \(\dfrac{7}{\dfrac{5}{3x}}=\dfrac{-\dfrac{4}{9}}{\dfrac{5}{6}}\)

\(\Rightarrow\dfrac{5}{3x}=\dfrac{7.\dfrac{5}{6}}{-\dfrac{4}{9}}\Rightarrow\dfrac{5}{3x}=-\dfrac{105}{8}\)

\(\Rightarrow\dfrac{1}{x}=-\dfrac{105}{8}:\dfrac{5}{3}=-\dfrac{63}{8}\Rightarrow x=-\dfrac{8}{63}\)

Đó nha ông anh đòi hoài!