Question

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Answer 1

ĐKXĐ:

a. \(2x-5\ge0\Rightarrow x\ge\dfrac{5}{2}\)

b. \(2-3x\ge0\Rightarrow x\le\dfrac{2}{3}\)

c. \(x\ge0\)

d. \(-x\ge0\Rightarrow x\le0\)

e. \(\dfrac{2x-3}{5}\ge0\Rightarrow x\ge\dfrac{3}{2}\)

f. \(\dfrac{2x-5}{-3}\ge0\Rightarrow2x-5\le0\Rightarrow x\le\dfrac{5}{2}\)

g. \(\dfrac{2x-5}{x+2}\ge0\Rightarrow\left[{}\begin{matrix}x< -2\\x\ge\dfrac{5}{2}\end{matrix}\right.\)

h. \(x^2+1\ge0\Rightarrow x\in R\)