Tính: B=2-4-6+8+10-12-14+…-2014+2016+2018-2020

Question

Tính:
B=2-4-6+8+10-12-14+…-2014+2016+2018-2020

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Delwyn 4 years 2021-04-27T00:34:55+00:00 2 Answers 53 views 0

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  1. kimchi2
    0
    2021-04-27T00:36:00+00:00
    Reply

    Đáp án:

     ` – 2`

    Giải thích các bước giải:

     `  B=2-4-6+8+10-12-14+…-2014+2016+2018-2020` 

    `B = ( 2-4-6+8) + ( 10-12-14+16)+..+(2010 – 2012-2014 + 2016) + ( 2018-2020)`

    ` B = 0 + 0 + … + 0 + ( 2018 –  2020 ) `

    ` B = 0 + -2 `

    ` B = -2 `

    VẬY ` B = -2`

  2. Verity
    0
    2021-04-27T00:36:16+00:00
    Reply

    Hình nha
    tinh-b-2-4-6-8-10-2016-2018-2020

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