Hệ phương trình \(\left\{{}\begin{matrix}x+2y=2\\y+2z=1\\z+2x=\dfrac{9}{4}\end{matrix}\right.\) có nghiệm là
\(\left(x;y;z\right)=\left(1;\dfrac{1}{2};\dfrac{1}{4}\right)\).\(\left(x;y;z\right)=\left(\dfrac{1}{2};\dfrac{3}{2};\dfrac{1}{4}\right)\).\(\left(x;y;z\right)=\left(\dfrac{1}{4};1;\dfrac{3}{2}\right)\).\(\left(x;y;z\right)=\left(1;\dfrac{2}{3};\dfrac{3}{4}\right)\).