`B=1/3+1/6+1/60+1/15+…+1/2021` Giúp mk với,mk cần gấp:

Question

`B=1/3+1/6+1/60+1/15+…+1/2021`
Giúp mk với,mk cần gấp:

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Kiệt Gia 5 years 2021-05-19T16:10:22+00:00 2 Answers 25 views 0

Answers ( )

  1. Neala
    0
    2021-05-19T16:11:33+00:00
    Reply

    Đáp án:

     `B=31/32`

    Giải thích các bước giải:

    đề sai :

    `B=1/3+1/6+1/60+1/15+…+1/2021`

    sửa lại :

    `B=1/3+1/6+1/10+1/15+…+1/2016`

    bài làm :

    `B=1/3+1/6+1/10+1/15+…+1/2016`

    `B=2/6+2/12+2/20+2/30+…+2/4032`

    `B=2/2.3+2/3.4+2/4.5+2/5.6+…+2/63.64`

    `B=2[1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+…+1/63-1/64]`

    `B=2[1/2-(1/3-1/3+1/4-1/4+1/5-1/5+1/6-…-1/63+1/64)]`

    `B=2[1/2-1/64]`

    `B=2*31/64`

    `B=31/32`

  2. giabao
    0
    2021-05-19T16:11:54+00:00
    Reply

    Đáp án:

    ` =>(1/2).B=1/2.(1/3+1/6+1/10+……….+1/2016)`

    `(1/2).B=1/6+1/12+1/20+…….+1/4042`

    `(1/2).B=1/(2.3)+1/(3.4)+………+1/(63.64)`

    `(1/2).B=1/2-1/3+1/3-1/4+…………+1/64-1/64`

    `(1/2).B=1/2-1/64=32/64-1/64`

    `(1/2).B=31/64`

    `B        =(31/64).2`

    `B=31/32`

    XIN HAY NHẤT NHA

     

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