tính nhanh [-1/6+5/-12]+7/12 -4/11+[1+7/11] 3/7+[4/7+ -2/3] [-2/8+ 3/8]+ -6/16

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1. Đáp án + giải thích bước giải :

   `[(-1)/6 + 5/(-12)] + 7/12`

   `= (-1)/6 + 5/(-12) + 7/12`

   `= (-1)/6 + (5/(-12) + 7/12)`

   `= (-1)/6 + 1/6`

   `= 0`

   `(-4)/11 + [1 + 7/11]`

   `= (-4)/11 + 1 + 7/11`

   `= ( (-4)/11 + 7/11) + 1`

   `= 3/11 + 1`

   `= 3/11 + 11/11`

   `= 14/11`

   `3/7 + [4/7 + (-2)/3]`

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

   `= 1 + (-2)/3`

   `= 3/3 + (-2)/3`

   `= 1/3`

   `[ (-2)/8 + 3/8] + (-6)/16`

   `= 1/8 + (-6)/16`

   `= 2/16 + (-6)/16`

   `= (-4)/16`

   `= (-1)/4`

   Trả lời

2. $\ (\dfrac{-1}{6} + \dfrac{5}{-12}) + \dfrac{7}{12}$

   $\ = \dfrac{-1}{6} + (\dfrac{-5}{12} + \dfrac{7}{12})$

   $\ = \dfrac{-1}{6} + \dfrac{1}{6}$
   $\ = 0$

   $\ \dfrac{-4}{11} + (1 + \dfrac{7}{11})$

   $\ = \dfrac{-4}{11} + \dfrac{7}{11} + 1$

   $\ = \dfrac{3}{11} + 1 = \dfrac{14}{11}$

   $\ \dfrac{3}{7} + (\dfrac{4}{7} + \dfrac{-2}{3})$

   $\ = (\dfrac{3}{7} + \dfrac{4}{7}) + \dfrac{-2}{3}$

   $\ = 1 + \dfrac{-2}{3} = \dfrac{1}{3}$

   Trả lời