Giải:
\(\sqrt{x^2-6x+9}+x=11\)
\(\Leftrightarrow\sqrt{x^2-2.x.3+3^2}+x=11\)
\(\Leftrightarrow\sqrt{\left(x-3\right)^2}+x=11\)
\(\Leftrightarrow\left|x-3\right|+x=11\)
\(\Leftrightarrow\left|x-3\right|=11-x\)
Xét trường hợp:
* \(x-3=11-x\)
\(\Leftrightarrow2x=14\)
\(\Leftrightarrow x=7\)
* \(x-3=-11+x\)
\(0x=-8\) (Vô lí)
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