Question

Answer 1

a) ĐK:\(x\le\dfrac{2}{3}\)

b) ĐK: \(x\ge-\dfrac{3}{2}\)

c) ĐK: \(x\in R\)

d) ĐK: \(x\in R\)

e) ĐK: \(\left\{{}\begin{matrix}x\ge1\\x\le-1\end{matrix}\right.\)

Answer 2

\(a,ĐKXĐ:x\le\dfrac{2}{3}\\ b,ĐKXĐ:\dfrac{4}{2x+3}\ge0\Leftrightarrow x\ge-\dfrac{3}{2}\\ c,ĐKXD:\dfrac{2}{x^2}\ge0\Leftrightarrow x\in R\\ d,ĐKXĐ:\dfrac{1}{x^2}\ge0\Leftrightarrow x\in R\\ e,ĐKXĐ:\left(x-1\right)\left(x+1\right)\ge0\Leftrightarrow\left[{}\begin{matrix}x\ge1\\x\le-1\end{matrix}\right.\)

Answer 3

a) ĐK:x≤2/3

b) ĐK: x≥−3/2

c) ĐK: x∈R

d) ĐK: x∈R

e) ĐK:  x≥1

            x≤−1

Answer 4

a: ĐKXĐ: \(x\le\dfrac{2}{3}\)

b: ĐKXĐ: \(x>-\dfrac{3}{2}\)

c: ĐKXĐ: \(x\ne0\)

d: ĐKXĐ: \(x\ne0\)

e: ĐKXĐ: \(\left[{}\begin{matrix}x\ge1\\x\le-1\end{matrix}\right.\)