Question

 a, \(x.\dfrac{1}{4}=\dfrac{1}{2}-\dfrac{4}{5}\)

b, \(\dfrac{2}{3}-x=\dfrac{1}{2}:\dfrac{3}{8}\)

Answer 1

a,

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

\(x.\dfrac{1}{4}=\dfrac{5}{10}-\dfrac{8}{10}\)

\(x.\dfrac{1}{4}=-\dfrac{3}{10}\)

\(\Rightarrow x=-\dfrac{3}{10}:\dfrac{1}{4}\)

\(\Rightarrow x=-\dfrac{3}{10}.4\)

\(\Rightarrow x=-\dfrac{6}{5}\)

b,

\(\dfrac{2}{3}-x=\dfrac{1}{2}:\dfrac{3}{8}\)

\(\dfrac{2}{3}-x=\dfrac{1}{2}.\dfrac{8}{3}\)

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

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

\(x=-\dfrac{2}{3}\)