\(\dfrac{x}{y}=\dfrac{11}{7}\) và x-y=12
\(\dfrac{x}{y}=\dfrac{11}{7}\Rightarrow\dfrac{x}{11}=\dfrac{y}{7}\) và x-y=12
\(\dfrac{x}{11}=\dfrac{y}{7}=\dfrac{x-y}{11-7}=\dfrac{12}{4}=3\)
\(\dfrac{x}{11}=3\Rightarrow x=33\)
\(\dfrac{y}{7}=3\Rightarrow y=21\)