Question

Tìm x:

\(a)\sqrt{x}< 1\\ b)\sqrt{x}< \sqrt{2}\\ c)\sqrt{x}\ge4\\ d)\sqrt{x}< 5\\ e)\sqrt{2x}< 4\)

Answer 1

Lời giải:
a)

PT \(\Leftrightarrow \left\{\begin{matrix} x\geq 0\\ x< 1\end{matrix}\right.\Leftrightarrow 0\leq x< 1\)

b)

PT \(\Leftrightarrow \left\{\begin{matrix} x\geq 0\\ x< 2\end{matrix}\right.\Leftrightarrow 0\leq x< 2\)

c)

PT \(\Leftrightarrow \left\{\begin{matrix} x\geq 0\\ x\geq 4^2\end{matrix}\right.\Leftrightarrow x\geq 16\)

d)

PT \(\Leftrightarrow \left\{\begin{matrix} x\geq 0\\ x< 5^2\end{matrix}\right.\Leftrightarrow 0\leq x< 25\)

e)

PT \(\Leftrightarrow \left\{\begin{matrix} 2x\geq 0\\ 2x< 4^2\end{matrix}\right.\Leftrightarrow 0\leq x< 8\)