A=4/1.2+4/2.3+4/3.4+........+4/2020.2021

Question

aihong · Answer

`A=4/(1.2)+4/(2.3)+4/(3.4)+........+4/(2020.2021)`     `A = 4 . (1/(1.2)+1/(2.3)+1/(3.4)+........+1/(2020.2021))`     `A = 4 . (1-1/2+1/2-1/3+1/3-1/4+.....+1/2020-1/2021)`     `A = 4 . (1-1/2021)`     `A = 4 . 2020/2021`     `A = 8080/2021`     (Ch&uacute;c bạn học tốt)

quynhnghi · Answer

`A= 4/1.2 + 4/2.3 + 4/3.4 +....+ 4/2020.2021`   `A = 4( 1/1.2 + 1/2.3 + 1/3.4 +....+ 1/2020.2021)`   `A= 4( 1/1 -1/2 + 1/2 -1/3 + 1/3 -1/4 +...+ 1/2020- 1/2021)`   `A = 4(1 - 1/2021)`   `A = 4. 2020/2021`   `A= 8080/2021`   Vậy `A= 8080/2021`

A=4/1.2+4/2.3+4/3.4+……..+4/2020.2021

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