tập xác định hàm số
a, y=\(\sqrt{x^2+x-4}\)
b , y = \(\frac{1}{x^2+1}\)
c , y=\(\frac{\left|2x-3\right|}{x^2+x+6}\)
d , y =\(\frac{1}{x^2-3x}\)
e , y =\(\sqrt{1-x}\) +\(\frac{1}{x\sqrt{1}+x}\)
f , \(\frac{2x-1}{\sqrt{x\sqrt{\left(x-4\right)}}}\)
g, y = \(\frac{x^2+1}{\sqrt{2-5}}\) + \(\frac{1}{x^2-1}\)
h , y= \(\frac{1}{\sqrt{2x^2-4x+4}}\)
i, \(\sqrt{6-x}\)+2x\(\sqrt{2x+1}\)
j, y = \(\sqrt{3+x}\) +\(\frac{1}{x^2-1}\)
k, y = \(\frac{1}{x^2+3x+3}\)+(x+2)\(\sqrt{x+3}\)
l, y =\(\sqrt[3]{\frac{3x+5}{x^2-1}}\)
