Question

\(A=\dfrac{5x-3y}{2x-y}\) biết \(\dfrac{x}{y}=\dfrac{6}{5}\)

Answer 1

\(\dfrac{x}{y}=\dfrac{6}{5}\Rightarrow x=\dfrac{6}{5}y\)

\(\Rightarrow A=\dfrac{5.\left(\dfrac{6}{5}y\right)-3y}{2.\left(\dfrac{6}{5}y\right)-y}=\dfrac{3y}{\dfrac{7y}{5}}=\dfrac{15}{7}\)

Answer 2

\(\dfrac{_{ }x}{^{ }y}\) = \(\dfrac{6}{5}\)  \(\Rightarrow\) \(_x\) =\(\dfrac{6}{5}\)\(y\)

\(^{ }\Rightarrow A\) =\(^{\dfrac{^{5.\dfrac{ }{ }}}{2.}(\dfrac{6}{5}}y)-3y_{_{_{_{_{_{_{_{ }}}}}}}}\)\(=\dfrac{3y}{7y}=\dfrac{15}{7}\)