\(\dfrac{2}{5}< \dfrac{m}{8}< \dfrac{3}{5}\)
\(\Rightarrow\dfrac{16}{40}< \dfrac{5m}{40}< \dfrac{24}{40}\)
\(\Rightarrow16< 5m< 24\)
\(\Rightarrow m=4\)
Vậy `m=4`
`2/5 < m/8 < 3/5`
`16/40 < [5m]/40 < 24/40`
`16 < 5m < 24`
`16/5 < m < 24/5`
`3,2 < m < 4,8`
Mầ `m` là số tự nhiên
`=>m =4`