7/2+7/6+7/12+…+7/9900

Question

7/2+7/6+7/12+…+7/9900

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Dulcie 5 years 2021-05-24T03:10:00+00:00 2 Answers 27 views 0

Answers ( )

  1. King
    0
    2021-05-24T03:11:44+00:00
    Reply

    `7/2 + 7/6 + 7/12 + … + 7/9900`

    `= 7 . ( 1/2 + 1/6 + 1/12 + … + 1/9900 )`

    `= 7 . ( 1/1.2 + 1/2.3 + 1/3.4 + … + 1/99 . 100 )`

    `= 7 . ( 1/1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + … + 1/99 – 1/100 )`

    `= 7 . 1/1 – 1/100`

    `= 693/100`

  2. thuthuy
    0
    2021-05-24T03:11:54+00:00
    Reply

    7/2+7/6+7/12+….+7/9900

    =7/1.2+7/2.3+7/3.4+…+7/99.100

    =7(1/1.2+1/2.3+1/3.4+…+1/99.100)

    =7.(1-1/2+1/2-1/3+1/3-1/4+…+1/99-1/100)

    =7.1/100=7/100 

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )