Ta có: x2+y2+z2=xy+yz+zx (gt)
\(\Leftrightarrow\)2x2+2y2+2z2=2xy+2yz+2zx
\(\Leftrightarrow\)x2-2xy+y2+y2-2yz+z2+z2-2zx+x2=0
\(\Leftrightarrow\)(x-y)2+(y-z)2+(z-x)2=0
\(\Leftrightarrow\)x=y,y=z,z=x
\(\Leftrightarrow\)x=y=z
Khi đó:x2016+y2016+z2016=32017
\(\Leftrightarrow\)3.x2016=32017
\(\Leftrightarrow\)x2016=32016
\(\Leftrightarrow\)x=\(\pm\)3
Vậy:x=y=z=3 hoặc x=y=z=-3
Ta có : \(x^2+y^2+z^2=xy+yz+xz\Leftrightarrow x^2+y^2+z^2-xy-yz-xz=0\)
\(\Leftrightarrow2\left(x^2+y^2+z^2-xy-yz-xz\right)=0\)
\(\Leftrightarrow\left(x-y\right)^2+\left(y-z\right)^2+\left(x-z\right)^2=0\)
\(\Leftrightarrow x=y=z\)
Mà \(x^{2016}+y^{2016}+z^{2016}=3^{2017}\)
\(x^{2016}=y^{2016}=z^{2016}=\frac{3^{2017}}{3}=3^{2016}\)
\(\Rightarrow x=y=z=\sqrt[2016]{3^{2016}}=3\)
