Question

Tìm X,biết:   7/12 < x/24 < 2/3

Answer 1

\(\dfrac{7}{12}< \dfrac{x}{24}< \dfrac{2}{3}\)

Ta có:

\(\dfrac{7}{12}=\dfrac{7x2}{12x2}=\dfrac{14}{24}\)\(;\dfrac{2}{3}=\dfrac{2x8}{3x8}=\dfrac{16}{24}\)

\(\Rightarrow x=15\)

Answer 2

\(\dfrac{7}{12}< \dfrac{x}{24}< \dfrac{2}{3}\)

\(\Rightarrow\dfrac{7\times2}{12\times2}< \dfrac{x}{24}< \dfrac{2\times8}{3\times8}\)

\(\Rightarrow\dfrac{14}{24}< \dfrac{x}{24}< \dfrac{16}{24}\)

\(\Rightarrow14< x< 16\)