a,-17/30-11/-15+-7/12 b,-5/9+5/9:(1 2/3-2 1/12) c,-7/25.11/13+-7/25.2/13-18/25

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1. Đáp án + Giải thích các bước giải:

   a)

   `(-17)/30-11/(-15)+(-7)/12`

   `=(-34)/60+44/60-35/60`

   `=-5/12`

   b)

   `(-5)/9+5/9:(1 2/3-2 1/12)`

   `=(-5)/9+5/9:(1 2/3-2 1/12)`

   `=(-5)/9+5/9:(5/3-25/12)`

   `=(-5)/9+5/9:(20/12-25/12)`

   `=(-5)/9+5/9:(-5)/12`

   `=(-5)/9+5/9. (-12)/5`

   `=(-5)/9+(-4)/3`

   `=(-5)/9+(-12)/9`

   `=(-17)/9`

   c)

   `(-7)/25. 11/13+(-7)/25. 2/13-18/25`

   `=(-7)/25.(11/13+2/13)-18/25`

   `=(-7)/25.1-18/25`

   `=(-7)/25-18/25`

   `=-1`

    

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2. `a,-17/30-11/-15+ -7/12`

   ` = -17/30 + 11/15 + – 7/12`

   ` = 1/6 + – 7/12`

   ` = -5/12`

   `b,-5/9+5/9:(1 2/3  – 2 1/12)` 

   ` = -5/9 + 5/9 : (5/3 – 25/12)`

   ` = -5/9 + 5/9 : (-5)/12`

   ` = -5/9 + (-4)/3`

   ` = -5/9 + (-12)/9`

   ` = -17/9`

   `c,-7/25 . 11/13+ -7/25. 2/13 – 18/25`

   ` = -7/25 . (11/13 + 2/13) – 18/25`

   ` = -7/25 . 1 – 18/25`

   ` = -7/25 – 18/25`

   ` = -1`

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