\(\Leftrightarrow x-1-2\sqrt{x-1}+1+y-2-4\sqrt{y-2}\)\(+4+x-3-6\sqrt{x-3}+9=0\)
\(\Leftrightarrow\left(\sqrt{x-1}-1\right)^2+\left(\sqrt{y-2}-2\right)^2+\left(\sqrt{z-3}-3\right)^2=0\)
\(\Leftrightarrow\hept{\begin{cases}x=2\\y=6\\z=12\end{cases}}\)
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Khó quá em mới lớp 5
HT