Tính nhanh , N = 1/1×5 + 1/5×10 + 1/10×15 + 1/15×20 + ……….. + 1/2005×2010

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Tính nhanh , N = 1/1×5 + 1/5×10 + 1/10×15 + 1/15×20 + ……….. + 1/2005×2010

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Caroline 3 tháng 2021-09-16T13:53:22+00:00 2 Answers 14 views 0

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    0
    2021-09-16T13:54:58+00:00

    `N=1/(1×5)+1/(5×10)+…+1/(2005×2010)`

    `N=1/(1×5)+1/5(5/(5×10)+5/(10×15)+…+5/(2005×2010)`

    `N=1/5+1/5(1/5-1/10+1/0-1/15+…+1/2005-1/2010)`

    `N=1/5+1/5(1/5-1/2010)`

    `N=1/5(1+1/5-1/2010)`

    `N=1/5 . 2411/2010`

    `N=2411/10050`

     

    0
    2021-09-16T13:55:07+00:00

    Đáp án:

     

    Giải thích các bước giải:

     

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