Dat \(\frac{x}{3}=\frac{y}{4}=a\)
=> \(\hept{\begin{cases}x=3a\\y=4a\end{cases}}\)
lai co xy = 192 => \(3a.4a=192\)
<=> \(12a^2=192\)
<=> \(a^2=16\)
<=> \(a=\pm4\)
nen suy ra \(a=\pm4=>\hept{\begin{cases}x=3.\pm4=\pm12\\y=\pm4.4=\pm16\end{cases}}\)
vay ta co 2 cap (x;y) thoa la (12;16) va (-12,-16)