Tính M=1/3.7 + 1/7.11 + 1/11.15 + 1/15.19 + 1/19.23

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Tính M=1/3.7 + 1/7.11 + 1/11.15 + 1/15.19 + 1/19.23

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Allison 1 tháng 2021-08-31T07:10:41+00:00 2 Answers 5 views 0

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    0
    2021-08-31T07:11:52+00:00

    Đáp án:

     5/69

    Giải thích các bước giải:

     M=1/4(1/3-1/7+1/7-1/11+1/11-1/15+1/15-1/19+1/1/19-1/23)

    M= 1/4(1/3-1/23)

    M= 5/69

    0
    2021-08-31T07:12:11+00:00

    `M= 1/3.7 + 1/7.11 + 1/11.15+1/15.19+ 1/19.23`

    `4M = 4( 1/3.7+ 1/7.11 + 1/11.15+ 1/15.19+1/19.23)`

    `4M = 4/3.7 + 4/7.11 + 4/11.15 +4/15.19+4/19.23`

    `4M = 1/3 – 1/7 + 1/7- 1/11 + 1/11 -1/15+1/15 – 1/19+1/19-1/23`

    `4M = 1/3 – 1/23`

    `4M =20/69`

    `M= 20/69 : 4`

    `M= 20/69  . 1/4`

    `M= 5/69`

    Vậy `M= 5/69`

     

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