Question

\(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)

Answer 1

        \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}.\)

<=> \(\dfrac{1}{4}:x=-\dfrac{7}{20}.\)

<=> \(x=-\dfrac{5}{7}.\)

Vậy \(x=-\dfrac{5}{7}.\)

Answer 2

\(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\\ \Rightarrow\dfrac{1}{4}:x=\dfrac{3}{4}-\dfrac{2}{5}\\ \Rightarrow x=\dfrac{1}{4}:\dfrac{7}{20}\\ \Rightarrow x=\dfrac{5}{7}\)