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).

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1. Bạn xen hình

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2. $a$) `(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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