Làm hộ bài 5 cái ????????…………

Question

Làm hộ bài 5 cái ????????…………
lam-ho-bai-5-cai

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Kiệt Gia 4 years 2020-10-15T02:17:13+00:00 1 Answers 89 views 0

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  1. Acacia
    0
    2020-10-15T02:18:48+00:00
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    `A = 5/(1 xx 6) + 5/(6xx11) + 5/(11xx16) + … + 5/(2001xx2006)`

    `A = 1 – 1/6 + 1/6 – 1/11 + 1/11 – 1/16 + … + 1/2001 – 1/2006`

    `A = 1 – 1/2006`

    `A = 2005/2006`

     

    `B = 1/(1xx6) + 5/(6xx11) + 5/(11xx16) + … + 5/(2001xx2006)`

    `5xxB = 5/(1xx6) + 5/(6xx11) + 5/(11xx16) + … + 5/(2001xx2006)`

    `5xxB = 1 – 1/6 + 1/6 – 1/11 + 1/11 – 1/16 + … + 1/2001 – 1/2006`

    `5xxB = 1 – 1/2006`

    `5xxB = 2005/2006`

    `B = 2005/2006 : 5`

    `B = 401/2006`

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