Question

tìm x

\(\dfrac{4}{7}+\dfrac{5}{9}:x=\dfrac{1}{5}\)

Answer 1

\(\dfrac{4}{7}+\dfrac{5}{9}:x=\dfrac{1}{5}\)

\(\Rightarrow\dfrac{5}{9}:x=\dfrac{1}{5}-\dfrac{4}{7}=\dfrac{7-20}{35}=\dfrac{-13}{35}\)

\(\Rightarrow\dfrac{5}{9}:x=\dfrac{-13}{35}\Rightarrow x=\dfrac{5}{9}:\dfrac{-13}{35}=\dfrac{5}{9}.\dfrac{35}{-13}=\dfrac{175}{-117}\)

\(\Rightarrow x=\dfrac{175}{-117}\)

Answer 2

\(\dfrac{4}{7}+\dfrac{5}{9}\) : x = \(\dfrac{1}{5}\)

\(\dfrac{5}{9}:\) x = \(\dfrac{1}{5}-\dfrac{4}{7}\)

\(\dfrac{5}{9}:\) x = \(-\dfrac{13}{35}\)

x = \(\dfrac{5}{9}:\left(-\dfrac{13}{35}\right)\)

x = \(-\dfrac{175}{117}\)