a) 10/9:x+7/12=-2/3 b) (13/24-29/30):(-51/5)

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1. a) `10/9 : x + 7/12 = -2/3`

   `10/9 : x = -2/3 – 7/12`

   `10/9 : x =   -5/4`

   `x = 10/9 : (-5/4)`

   `x =  -8/9`

   b) `(13/24 – 29/30) : (-51/5)`

   `= (65/120 – 116/120) : (-51/5)`

   `= (-51/120) : (-51/5)`

   `= ((-51) : (-51))/(120:5)`

   `= 1/24`

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2. Tìm x

   a) `10/9 : x + 7/12 = -2/3`

   `10/9 : x = -2/3 – 7/12`

   `10/9 : x = -5/4`

   `x = 10/9 : -5/4`

   `x = 10/9 . (-4/5)`

   `x = -8/9`

   Vậy `x = -8/9`

   Tính

   b) `(13/24 – 29/30) : (-51/5)`

   ` = -17/40 : (-51/5)`

   ` = -17/40 . (-5/51)`

   `= 1/24`

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