Question

[nguyễn phu trọng]

(y-2/5):4/3= 3/8 tính giá trị của y

Answer 1

[Hà Quang Minh]

\(\left(y-\dfrac{2}{5}\right):\dfrac{4}{3}=\dfrac{3}{8}\\ \Leftrightarrow y-\dfrac{2}{5}=\dfrac{3}{8}\cdot\dfrac{4}{3}\\ \Leftrightarrow y-\dfrac{2}{5}=\dfrac{1}{2}\\ \Leftrightarrow y=\dfrac{9}{10}\)

Answer 2

[Nguyễn Đăng Nhân]

\(\left(y-\dfrac{2}{5}\right):\dfrac{4}{3}=\dfrac{3}{8}\)

\(y-\dfrac{2}{5}=\dfrac{3}{8}\cdot\dfrac{4}{3}=\dfrac{3\cdot4}{2\cdot4\cdot3}\)

\(y-\dfrac{2}{5}=\dfrac{1}{2}\)

\(y=\dfrac{1}{2}+\dfrac{2}{5}\)

\(y=\dfrac{5}{10}+\dfrac{4}{10}=\dfrac{9}{10}\)