Question

\(\sqrt{3x}-5\sqrt{12x}+7\sqrt{27x}=12\)

Answer 1

\(\Leftrightarrow\sqrt{3x}-10\sqrt{3x}+21\sqrt{3x}=12\)

=>12 căn 3x=12

=>3x=1

=>x=1/3

Answer 2

ĐKXĐ: \(x\ge0\)

\(\sqrt{3x}-5.\sqrt{2^2.3x}+7\sqrt{3^2.3x}=12\)

\(\Leftrightarrow\sqrt{3x}-10\sqrt{3x}+21\sqrt{3x}=12\)

\(\Leftrightarrow12\sqrt{3x}=12\)

\(\Leftrightarrow\sqrt{3x}=1\)

\(\Leftrightarrow3x=1\)

\(\Leftrightarrow x=\dfrac{1}{3}\)