Question

So sánh phân số 2019/2020 và 2020/2021

Answer 1

Ta có:

`1-2019/2020=1/2020`

`1-2020/2021=1/2021`

Vì `2020 < 2021=>1/2020 > 1/2021`

      `=>1-2019/2020 > 1-2020/2021`

      `=>-2019/2020 > -2020/2021`

      `=>2019/2020 < 2020/2021`

Answer 2

\(\dfrac{2019}{2020}=1-\dfrac{1}{2020}\\ \dfrac{2020}{2021}=1-\dfrac{1}{2021}\\ Tacs\\ 2020< 2021\\ =>\dfrac{1}{2020}< \dfrac{1}{2021}\\ 1-\dfrac{1}{2020}< 1-\dfrac{1}{2021}\\ =>\dfrac{2019}{2020}< \dfrac{2020}{2021}\)

Answer 3

2019/2020=1-1/2020

2020/2021=1-1/2021

mà 1/2020>1/2021

nên 2019/2020<2020/2021