xin chào các anh chị em là em họ của chủ acc anh chị giúp em nha
`2022 /2021 - 2021/2020 + 1/2021 xx 2020`
`=2022 /2021 - 2021/2020 + 2020/2021`
`=( 2022 /2021 + 2020/2021 ) - 2021/2020 `
`= 4042/2021 - 2021/2020`
`= 2 - 2021/2020`
`= 4040/2020 - 2021/2020`
`= 2019/2020`
\(\dfrac{2022}{2021}-\dfrac{2021}{2020}+\dfrac{1}{2021\times2020}\\ =\dfrac{2022}{2021}-\dfrac{2021}{2020}+\dfrac{1}{2020}-\dfrac{1}{2021}\\ =\left(\dfrac{2022}{2021}-\dfrac{1}{2021}\right)-\left(\dfrac{2021}{2020}-\dfrac{1}{2020}\right)\\ =\dfrac{2021}{2021}-\dfrac{2020}{2020}\\ =1-1=0\)
\(\dfrac{2022}{2021}-\dfrac{2021}{2020}+\dfrac{1}{2021}\times2020\)
= \(\dfrac{2022}{2021}-\dfrac{2021}{2020}+\dfrac{2020}{2021}\)
= \(\dfrac{2022}{2021}+\dfrac{2020}{2021}-\dfrac{2021}{2020}=\dfrac{4042}{2021}-\dfrac{2021}{2020}=2-\dfrac{2021}{2020}\)
= \(\dfrac{4040}{2020}-\dfrac{2021}{2020}=\dfrac{2019}{2020}\)
