Đề bài : tính nhanh Giúp mình với

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Đề bài : tính nhanh
Giúp mình với
de-bai-tinh-nhanh-giup-minh-voi

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Sigridomena 10 months 2021-04-20T20:02:02+00:00 2 Answers 21 views 0

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  1. ngocdiep
    0
    2021-04-20T20:03:16+00:00
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    1) 

    `7/13 – 4/5 + 9/5 -33/13`

    `= (7/13 -33/13) + ( -4/5 + 9/5 )`

    `= -2+ 1`

    `=-1`

    2)

    `4 4/9 -( 2 2/7 + 3 4/9)`

    `= 4 4/9 – 2 2/7 – 3 4/9`

    `= 1 – 2 2/7`

    `= 1 -16/7`

    `=-9/7`

    3) 

    `360 . (13/180 – 7/120 + 1/450)`

    `= (360.13)/180 – (360.7)/120 + 360/450`

    `= 2. 13 – 3.7 +4/5`

    `= 26 – 21 + 4/5`

    `=5 + 4/5`

    `=29/5`

    4)

    `-5/11 . 4/17 + 2/33 + (-4/17) . 12/11`

    `= -5/11 . 4/17 + 2/33 + 4/17 . (-12/11)`

    `= 4/17[(-5/11) + (-12/11)] + 2/33`

    `=4/17 .(-17/11) + 2/33`

    `= -4/11 + 2/33`

    `= -10/33`

    5)

    `(-45/7 : 13/23 + (-45/7) . 3/13) : 45`

    `= ( -45/7 . 23/13 + (-45/7) . 3/13) :45`

    `= -45/7(23/13 + 3/13) : 45`

    `= -45/7 . 2 . 1/45`

    `=-2/7`

    6)

    `13/15 (15/13 -2) – 8/45 .( 45+ 3/2)`

    `= 13/15 . 15/13 – 2 . 13/15 – 8/45 . 45 – 8/45 . 3/2`

    `= 1- 26/15 -8 -4/15`

    `= -7 – 2`

    `=-9`

     

  2. Maris
    0
    2021-04-20T20:03:35+00:00
    Reply

    Đáp án +Giải thích các bước giải:

     

    de-bai-tinh-nhanh-giup-minh-voi

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