a)x+3/16=-5/24 b)1/20-[x-8/15]=–1/30 c)-x-9/2012=1

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1. `a,x+3/16=-5/24`

   `⇔x=-5/24 – 3/16`

   `⇔x=-19/48`

   `b,1/20 -(x-8/15)=-1/30`

   `⇔1/20-x+8/15=-1/30`

   `⇔7/12-x=-1/30`

   `⇔x=7/12-(-1/30)`

   `⇔x=37/60`

   `c,-x-9/2012=1`

   `⇔-x=1+9/2012`

   `⇔-x=2021/2012`

   `⇒x=-2021/2012`

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2. Bạn tham khảo :

   $x + \dfrac{3}{16} = \dfrac{-5}{24}$

   $x = \dfrac{-5}{24} – \dfrac{3}{16}$     

   $x – \dfrac{-19}{48}$

   $\dfrac{1}{20} – [ x – \dfrac{8}{15}] = -\dfrac{-1}{30}$

   ⇒ $x – \dfrac{8}{15} =  \dfrac{1}{60}$
   ⇒ $x =\dfrac{11}{20}$

   $-x – \dfrac{9}{2012} =1$

   $⇒ -x = 1 + \dfrac{9}{2012}$

   $⇒ -x =\dfrac{2021}{2012}$

   ⇒ $x = -\dfrac{2021}{2012}$

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