Toán tính tổng : 1/2021 + 2/2021 + 3/2021 + … + 2020/2021 19/11/2021 By Abigail tính tổng : 1/2021 + 2/2021 + 3/2021 + … + 2020/2021
` 1/2021 + 2/2021 + 3/2021 + … + 2020/2021` `=(1+2+…+2020)/2021` `={(2020+1)×2020:2}/2021` `=(2021×1010)/2021` `=1010` Trả lời
`1/2021 + 2/2021 + 3/2021 + … + 2020/2021` `= (1+2+3+…+2020)/2021` `= {(2020+1).[(2020-1):(2-1)+1)]:2}/2021` `= {2021.[(2019:1+1)]:2}/2021` `= {2021.2020:2}/2021` `= {2021.2020. 1/2}/2021` `= 2020. 1/2 = 1010` XIN HAY NHẤT Ạ Trả lời
` 1/2021 + 2/2021 + 3/2021 + … + 2020/2021`
`=(1+2+…+2020)/2021`
`={(2020+1)×2020:2}/2021`
`=(2021×1010)/2021`
`=1010`
`1/2021 + 2/2021 + 3/2021 + … + 2020/2021`
`= (1+2+3+…+2020)/2021`
`= {(2020+1).[(2020-1):(2-1)+1)]:2}/2021`
`= {2021.[(2019:1+1)]:2}/2021`
`= {2021.2020:2}/2021`
`= {2021.2020. 1/2}/2021`
`= 2020. 1/2 = 1010`
XIN HAY NHẤT Ạ