Tìm x a,(x+3/5):4/3=5/6 b,x.1212/1515-x.1919/2020=6/-5 Tính nhanh a,-17/18.3/7-17/18.4/7 b,7777/8888.13/17+7/8.4/17 Tính a,(-3/4+2/5):4/15+(3/4-4/5).

Question

Tìm x
a,(x+3/5):4/3=5/6
b,x.1212/1515-x.1919/2020=6/-5
Tính nhanh
a,-17/18.3/7-17/18.4/7
b,7777/8888.13/17+7/8.4/17
Tính
a,(-3/4+2/5):4/15+(3/4-4/5).5/2

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Nevaeh 2 tháng 2021-08-18T22:57:09+00:00 2 Answers 2 views 0

Answers ( )

    0
    2021-08-18T22:58:40+00:00

    Bạn xen hình

    0
    2021-08-18T22:59:02+00:00

    $a$) `(x + 3/5) : 4/3 = 5/6`

    `⇔ x+ 3/5 = 10/9`

    `⇔ x = {23}/45`

      Vậy `x = 23/45`

    $b$) `x. 1212/1515-x. 1919/2020=6/-5`

    `⇔ x (12/15 – 19/20) = -6/5`

    `⇔ x . {-3}/20 = -6/5`

    `⇔ x = 8`

      Vậy `x=8`

    $a$) `-17/18. 3/7-17/18 .4/7`

    `= -17/18 . (3/7 + 4/7)`

    `= -17/18`

    $b$) `7777/8888. 13/17+7/8. 4/17`

    `= 7/8 . (13/17 + 4/17)`

    `=7/8`

    $a$) `(-3/4+2/5):4/15+(3/4-4/5).5/2`

    `= -21/16 – 1/8`

    `= {-23}/16`

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