A=B chắc vậy.
Để mik tìm cách làm r gửi cho nha!!!!!
Ta có :
B = 2018 + 2019/2019 + 2020
= 2018/2019 + 2020 + 2019/2019 + 2020
Ta thấy :
2018/2019 > 2018/2019 + 2020 ( Vì 2019 > 2019 + 2020 )
2019/2020 > 2019/2019 + 2020 ( Vì 2019 > 2019 + 2020 )
=> 2018/2019 + 2019/2020 > 2018/2019 + 2020 + 2019/2019 + 2020
=> A > B
A=2018.2020=2018.(2019+1)
=2018.2019+2018.1
B=2019.2019=2019.(2018+1)
=2019.2018+2019.1
Vì 2019.1>2018.1
Nên B>A
hay 2019.2019>2018.2020