Với giá trị nào của x thì mỗi căn thức sau có nghĩa:
1,\(\sqrt{6x+1}\)
2, \(\sqrt{-8x}\)
3, \(\sqrt{4-5x}\)
4, \(\sqrt{\left(\sqrt{3}-x\right)^2}\)
5, \(\sqrt{x^2+2x+1}\)
6, \(\sqrt{\frac{1}{4}-2a}\)
7, \(\sqrt{\frac{-3}{2+x}}\)
8, \(\sqrt{\left(x+5\right)^2}\)
9, \(\sqrt{\frac{\sqrt{6}+4}{m-2}}\)
10, \(\frac{16x-1}{\sqrt{x-7}}\)
11, \(\sqrt{2x+5}\)
12, \(\frac{3}{\sqrt{12x-1}}\)
13, \(\sqrt{x^2-9}\)
14, \(\sqrt{\left(3x+2\right).\left(x-1\right)}\)
1) \(x\ge\frac{1}{6}\)
2.\(x\le0\)
3.\(4-5x\ge0\Leftrightarrow x\le\frac{4}{5}\)
4.mọi x