Question

tìm x ϵ N , biết  \(\dfrac{7}{9}\) + \(\dfrac{1}{3}\) < x < \(\dfrac{43}{8}\) + \(\dfrac{1}{10}\)

Answer 1

\(\dfrac{7}{9}+\dfrac{1}{3} < x < \dfrac{43}{8}+\dfrac{1}{10}\)

\(\dfrac{10}{9} < x < \dfrac{219}{40}\)

  Mà \(x \in N\)

  \(=>x=\){`2;3;4;5`}

Answer 2

\(\dfrac{7}{9}+\dfrac{1}{3}< x< \dfrac{43}{8}+\dfrac{1}{10}\)

\(\dfrac{10}{9}< x< \dfrac{219}{40}\)

Mà \(x\inℕ\)

\(\Rightarrow\dfrac{10}{9}< 2\le x\le5< \dfrac{219}{40}\)

\(\Rightarrow2\le x\le5\)

\(\Rightarrow x\in\left\{2;3;4;5\right\}\)

Vậy: \(x\in\left\{2;3;4;5\right\}\)