Question

3/4+1/4:x=2/5

Answer 1

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

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

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

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

\(x=-\dfrac{5}{7}\)

Answer 2

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

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

\(\Rightarrow\dfrac{1}{4}:x=\dfrac{-7}{20}\)

\(\Rightarrow x=\dfrac{1}{4}:\dfrac{-7}{20}\)

\(\Rightarrow x=\dfrac{-5}{7}\)

Vậy \(x=-\dfrac{5}{7}.\)

Answer 3

Giải:

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

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

\(\Rightarrow\dfrac{1}{4}:x=-\dfrac{7}{20}\)

\(\Leftrightarrow x=\dfrac{1}{4}:\dfrac{-7}{20}=\dfrac{1}{4}.\dfrac{-20}{7}=\dfrac{-5}{7}\)

Vậy \(x=\dfrac{-5}{7}\)

Chúc bạn học tốt!

Answer 4

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

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

\(\Leftrightarrow\dfrac{1}{4}:x=\dfrac{-7}{20}\)

\(\Leftrightarrow x=\dfrac{1}{4}:\dfrac{-7}{20}\)

\(\Leftrightarrow x=\dfrac{5}{-7}\)

Answer 5

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

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

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

=>\(x=\dfrac{1}{4}:\left(-\dfrac{7}{20}\right)\)

=>\(x=-\dfrac{5}{7}\)