Ta có: \(\frac{x+y}{3}=\frac{5-z}{1}=\frac{y+z}{2}=\frac{9+y}{5}=\frac{5-z+\left(y+z\right)-\left(9+y\right)}{1+2-5}=\frac{-4}{-2}=2\)
Suy ra: +) \(5-z=2\) \(\Rightarrow z=3\)
+) \(9+y=10\) \(\Rightarrow y=1\)
+) \(x+y=6\) \(\Rightarrow x+1=6\) \(\Rightarrow x=5\)
Vậy \(x=5;y=1;z=3\)