Question

So sánh A và B, biết:

A= 2018 x 2020 + 2021 

và B= 2019 x 2019 + 2021

Answer 1

\(A=2018\times2020+2021\) và \(B=2019\times2019+2021\)

\(A=2018\times2019+2018+2021\)

\(B=2018\times2019+2019+2021\)

Vì \(2019>2018\Rightarrow A< B\)

Answer 2

Ta có :

2018 x 2020 = 2018 x ( 2019 + 1 ) = 2018 + 2018 x 2019 < 2019 + 2018 x 2019 = 2019 x ( 2018 + 1 )

= 2019 x 2019

=> 2018 x 2020 < 2019 x 2019

=> 2018 x 2020 + 2021 < 2019 x 2019 + 2021

=> A < B

Answer 3

\(A=2018.2020+2021=2018.2019+2018+2021\)

\(B=2019.2019+2021=2018.2019+2019+2021\)

\(\Rightarrow A< B\)

Answer 4

         Bài làm :

Ta có :

2018 x 2020 = 2018 x ( 2019 + 1 ) = 2018 + 2018 x 2019 < 2019 + 2018 x 2019 = 2019 x ( 2018 + 1 )

= 2019 x 2019

=> 2018 x 2020 < 2019 x 2019

=> 2018 x 2020 + 2021 < 2019 x 2019 + 2021

=> A < B