\(\dfrac{7}{8}=1-\dfrac{1}{8}\\ \dfrac{2017}{2018}=1-\dfrac{1}{2018}\\ \dfrac{1}{8}>\dfrac{1}{2018}\Rightarrow1-\dfrac{1}{8}< 1-\dfrac{1}{2018}\\ \Leftrightarrow\dfrac{7}{8}< \dfrac{2017}{2018}\)
a, Ta có : \(\dfrac{7}{8}=1-\dfrac{1}{8}\)
\(\dfrac{2017}{2018}=1-\dfrac{1}{2018}\)
Mà \(\dfrac{1}{8}>\dfrac{1}{2018}\Rightarrow1-\dfrac{1}{8}< 1-\dfrac{1}{2018}\)
=> \(\dfrac{7}{8}< \dfrac{2017}{2018}\)
@li saron