Question

Tìm phân số \(\dfrac{a}{b}\):
\(\dfrac{a}{b}x\dfrac{8}{11}=\dfrac{2}{3}\)
\(\dfrac{9}{2}-\dfrac{a}{b}=\dfrac{2}{3}+3\)

Answer 1

\(\dfrac{a}{b}=\dfrac{2}{3}:\dfrac{8}{11}\)

\(\dfrac{a}{b}=\dfrac{11}{12}\)

 

\(\dfrac{9}{2}-\dfrac{a}{b}=\dfrac{11}{3}\)

\(\dfrac{a}{b}=\dfrac{9}{2}-\dfrac{11}{3}\)

\(\dfrac{a}{b}=\dfrac{5}{6}\)

Answer 2

\(\dfrac{a}{b}\times\dfrac{8}{11}=\dfrac{2}{3}\\ \dfrac{a}{b}=\dfrac{2}{3}:\dfrac{8}{11}\\ \dfrac{a}{b}=\dfrac{2}{3}\times\dfrac{11}{8}\\ \dfrac{a}{b}=\dfrac{11}{12}\\ ------\\ \dfrac{9}{2}-\dfrac{a}{b}=\dfrac{2}{3}+3\\ \dfrac{9}{2}-\dfrac{a}{b}=\dfrac{11}{3}\\ \dfrac{a}{b}=\dfrac{9}{2}-\dfrac{11}{3}\\ \dfrac{a}{b}=\dfrac{5}{6}\)