Question

Tìm x \(\in Z\), biết

\(0,27+\dfrac{1}{2}< x\%< 1-20\%\)

Answer 1

Giải:

\(0,27+\dfrac{1}{2}< x\%< 1-20\%\)

\(\Leftrightarrow\dfrac{77}{100}< \dfrac{x}{100}< \dfrac{4}{5}\)

\(\Leftrightarrow\dfrac{77}{100}< \dfrac{x}{100}< \dfrac{80}{100}\)

\(\Leftrightarrow77< x< 80\)

\(\Leftrightarrow x=\left\{78;79\right\}\)

Vậy ...

Answer 2

\(0,27+\dfrac{1}{2}< x\%< 1-20\%\)

\(\Rightarrow\) \(\dfrac{27}{100}+\dfrac{50}{100}< \dfrac{x}{100}< \dfrac{100}{100}-\dfrac{20}{100}\)

\(\Rightarrow\) \(\dfrac{77}{100}< \dfrac{x}{100}< \dfrac{80}{100}\)

\(\Rightarrow\) \(77< x< 80\)

\(\Rightarrow\) \(x\in\left\{78;79\right\}\)

Vậy \(x\in\left\{78;79\right\}\)