Cho biết \(\sqrt{36x}-\sqrt{4x}=3\). Hỏi x = ?
\(x=\dfrac{9}{16}\). \(x=\dfrac{3}{4}\). \(x=\dfrac{1}{4}\). \(x=\dfrac{5}{4}\). Hướng dẫn giải:\(\sqrt{36x}-\sqrt{4x}=3\Leftrightarrow6\sqrt{x}-2\sqrt{x}=3\)\(\Leftrightarrow4\sqrt{x}=3\)\(\Leftrightarrow\sqrt{x}=\dfrac{3}{4}\)\(\Leftrightarrow x=\dfrac{9}{16}\)
