Question

tìm y

19/20-y=8/5-3/4

y:2/3=4/9x3

 

Answer 1

\(\dfrac{19}{20}-y=\dfrac{8}{5}-\dfrac{3}{4}\)

\(\Leftrightarrow\dfrac{19}{20}-y=\dfrac{32-15}{20}\)

\(\Leftrightarrow\dfrac{19}{20}-y=\dfrac{17}{20}\Leftrightarrow y=\dfrac{19}{20}-\dfrac{17}{20}=\dfrac{2}{20}=\dfrac{1}{10}\)

\(y:\dfrac{2}{3}=\dfrac{4}{9}.3\)

\(\Leftrightarrow y:\dfrac{2}{3}=\dfrac{12}{9}\Leftrightarrow y=\dfrac{12}{9}.\dfrac{2}{3}=\dfrac{8}{9}\)

Answer 2

\(a.\dfrac{19}{20}-y=\dfrac{17}{20}\)

\(y=\dfrac{2}{17}\)

\(b.y:\dfrac{2}{3}=\dfrac{4}{3}\)

\(y=\dfrac{8}{9}\)