Question

so sánh 

2019.2021 và \(2020^2\)

Answer 1

2019.2021=(2020+1)2019=2019.2010+2019

2010²=(2019+1)2020

=2019.2020+2020

2019.2020+2019<2019.2020+2020=>2019.2021<2020²

Vậy 2019.2011<2020²

Answer 2

2019.2021=(2020+1)2019=2019.2010+2019

2010²=(2019+1)2020

=2019.2020+2020

2019.2020+2019<2019.2020+2020=>2019.2021<2020²

Vậy 2019.2011<2020²