Ta có:\(\dfrac{x}{y}=64\)
\(\Rightarrow\dfrac{x}{y}\cdot\dfrac{1}{y}=64\cdot\dfrac{1}{y}\)
\(\Rightarrow\dfrac{x}{y^2}=\dfrac{64}{y}\)
Hay \(16=\dfrac{64}{y}\)
\(\Rightarrow y=\dfrac{64}{16}\)
\(\Rightarrow y=4\)
\(\Rightarrow\dfrac{x}{4}=64\)
\(\Rightarrow x=64\cdot4\)
\(\Rightarrow x=256\)
Vậy cặp số (x;y) thỏa mãn là (256;4)
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