Question

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Answer 1

\(\left(\dfrac{-8}{5}+\dfrac{-1}{2}\right)^2>x>\left(\dfrac{-9}{5}-\dfrac{-1}{2}\right)^2\)

\(\Rightarrow\left(\dfrac{-21}{10}\right)^2>x>\left(\dfrac{-13}{10}\right)^2\)

\(\Rightarrow\dfrac{441}{100}>x>\dfrac{169}{100}\)

\(\Rightarrow4,41>x>1,69\)

Vì \(x\in Z\)

\(\Rightarrow x\in\left\{2;3;4\right\}\)

Vậy...

Answer 2

S={2;3;4}