c: Ta có: \(\sqrt{25x-50}+2\cdot\sqrt{\dfrac{49x-98}{4}}=6\)
\(\Leftrightarrow5\sqrt{x-2}+7\sqrt{x-2}=6\)
\(\Leftrightarrow12\sqrt{x-2}=6\)
\(\Leftrightarrow x-2=\dfrac{1}{4}\)
hay \(x=\dfrac{9}{4}\)
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