tính nhanh 1/2+2/8+3/28+4/77+5/176+6/352

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tính nhanh 1/2+2/8+3/28+4/77+5/176+6/352

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Amaya 1 tháng 2021-09-02T13:37:36+00:00 2 Answers 9 views 0

Answers ( )

    0
    2021-09-02T13:38:45+00:00

    Đáp án:

    ` 21/22`

    Giải thích các bước giải:

        `1/2+2/8+3/28+4/77+5/176+6/352`

    ` =1/1.2 + 1/2.4 + 1/4.7 + 1/7.11 + 1/11 .16 + 1/16.22`

    `= 1 – 1/12 + 1/2 – 1/4 + 1/4 – 1/7 + 1/7 – 11 + 1/11- 1/16 + 1/16 – 1/22`

    `= 1 – 1/22`

    `=22/22 – 1/22 = 21/22`

    0
    2021-09-02T13:38:59+00:00

    1/2+2/8+3/28+4/77+5/176+6/352

    =1/1.2+2/2.4+3/4.7+4/7.11+5/11.16+6/16.22

    =1/1-1/2+1/2-1/4+1/4-1/7+1/7-1/11+1/11-1/16+1/16-1/22

    =1-1/22

    =21/22

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