Câu 7;
a) ĐKXĐ: \(x\ge0\)
\(3\sqrt{x}=\sqrt{12}\\ \Rightarrow9x=12\\ \Rightarrow x=\dfrac{4}{3}\)
b) ĐKXĐ: \(x\ge6\)
\(\sqrt{x-6}=3\\ \Rightarrow x-6=9\\ \Rightarrow x=15\)
c) ĐKXĐ: \(x\ge\dfrac{1}{2}\)
\(\sqrt{2x-1}=\sqrt{5}\\ \Rightarrow2x-1=5\\ \Rightarrow x=3\)
Câu 7;
a) ĐKXĐ: x≥0
x≥12
√2x−1=√5⇒2x−1=5⇒x=3