j: ĐKXĐ: \(\left[{}\begin{matrix}x\ge\sqrt{2}\\x\le-\sqrt{2}\end{matrix}\right.\)
k: ĐKXĐ: \(x\in R\)
l: ĐKXĐ: \(-\dfrac{5}{2}\le x\le\dfrac{5}{2}\)
n: ĐKXĐ: \(\left[{}\begin{matrix}x\ge\dfrac{3}{2}\\x\le1\end{matrix}\right.\)
p: ĐKXĐ: 0<x<2
q: ĐKXĐ: \(\left[{}\begin{matrix}x>3\\x< 2\end{matrix}\right.\)
r: ĐKXĐ: \(3< x< 5\)
a: ĐKXĐ: \(x\ge\dfrac{1}{3}\)
b: ĐKXĐ: \(x\le\dfrac{5}{3}\)
c: ĐKXĐ: \(2\le x\le4\)
d: ĐKXĐ: \(x>2\)
e: ĐKXĐ: \(x>2\)
f: ĐKXĐ: \(-\dfrac{2}{7}< x\le3\)
g: ĐKXĐ: \(-2\le x< \dfrac{7}{2}\)
h: ĐKXĐ: \(x>0\)
i: ĐKXĐ: x>1