So sánh: 

- Hướng dẫn giải

Ta có:

$A=\frac{2017}{2018}+\frac{2018}{2019}>\frac{2010}{2011}+\frac{2011}{2012}=\frac{2010+2011}{2012}>\frac{2010+2011}{2011+2012}=B$

Vậy  A > B