ta có: \(\frac{2018}{2019}>\frac{2018}{2019+2020};\frac{2019}{2020}>\frac{2019}{2019+2020}.\)
\(\Rightarrow A=\frac{2018}{2019}+\frac{2019}{2020}>\frac{2018}{2019+2020}+\frac{2019}{2019+2020}=\frac{2018+2019}{2019+2020}=B\)
....
Vì \(\frac{2018}{2019}\)< 1\(\Rightarrow\)\(\frac{2018}{2019}\)>\(\frac{2018}{2019+2020}\)
Vì\(\frac{2019}{2020}\)< 1\(\Rightarrow\)\(\frac{2019}{2020}\)>\(\frac{2019}{2019+2020}\)
\(\Rightarrow\)\(\frac{2018}{2019}\)+\(\frac{2019}{2020}\)>\(\frac{2018}{2019+2020}\)+\(\frac{2019}{2019+2020}\)=\(\frac{2018+2019}{2019+2020}\)
\(\Rightarrow\)A>B