Ta có\(\frac{Yx7x8}{12x56}=\frac{3}{4}\Leftrightarrow\frac{Yx56}{672}=\frac{3}{4}=\frac{504}{672}\)
\(\Rightarrow Yx56=504\Rightarrow y=504:56=9\)
Vaayj Y=9
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