1/1+2 + 1/2+3 + 1/ 3+4 + …… 1/2019+2020 = …. , giúp em với ạ , mai nộp bài rùi .

Question

1/1+2 + 1/2+3 + 1/ 3+4 + …… 1/2019+2020 = …. , giúp em với ạ , mai nộp bài rùi .

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Huy Gia 1 year 2020-10-14T00:54:10+00:00 2 Answers 86 views 0

Answers ( )

  1. dangkhoa
    0
    2020-10-14T00:55:35+00:00
    Reply

    `1/1.2` + `1/2.3` + `1/ 3.4` + …… +`1/2019.2020 `

    = 1 – `1/2` + `1/2` – `1/3` + ………+ `1/2019` – `1/2020`

    = 1 – `1/2020`

    = `2020/2020` – `1/2020`

    = `1019/2020`

    XIN HAY NHẤT 

  2. Euphemia
    0
    2020-10-14T00:55:35+00:00
    Reply

    `1/(1.2)` + `1/(2.3)` + `1/( 3.4)` + …… +`1/(2019.2020) `

    = `1 – 1/2 + 1/2 – 1/3 + ………+ 1/2019 – 1/2020`

    = `1 – 1/2020`

    = `2020/2020 – 1/2020`

    = `2019/2020`

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