cho cách làm và đáp số :) =) ;)

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cho cách làm và đáp số 🙂 =) 😉
cho-cach-lam-va-dap-so

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Thiên Di 5 years 2021-05-22T17:40:19+00:00 2 Answers 16 views 0

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  1. niczorrrr
    0
    2021-05-22T17:42:01+00:00
    Reply

    `B= 2008/1 + 2007/2 + 2006/3+…+2/2007 + 1/2008`

    `B= (2007/2 +1) + (2006/3+1)+…+(2/2007+1)+(1/2008+1) + (2008/1+1)`

    `B= 2009/2 + 2009/3 +….+2009/2007 +2009/2008 + 2009/2009`

    `B=2009(1/2 + 1/3+…..+1/2007 + 1/2008 + 1/2009)`

    => `A:B = (1/2+1/3+1/4+…+1/2008 +1/2009)/(2009(1/2+1/3+…+1/2007+1/2008+1/2009)`

    => `A:B= 1/2009`

    Vậy `A:B = 1/2009`

  2. bonexptip
    0
    2021-05-22T17:42:18+00:00
    Reply

    Đáp án:

    B=2008/1+2007/2+2006/3+………….+2/2007+1/2008

       =1+(2007/2+1)+(2006/3+1)+……………..(2/2007+1)+(1/2008+1)

       =2009/2009+2009/2+2009/3+……………..2009/2007+2009/2008

       =2009(1/2+1/3+1/4+……………….+1/2007+1/2008+1/2009)

     khi đó A/B=20091/2+1/3+1/4+….+1/2007+1/2008+1/2009/2009(1/2+1/3+1/4+………….+1/2007+1/2008+1/2009)

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