A=(-3+6).(-4)-12 B=3/5+-7/10.(-2) Tìm x 2.x=3/4-5/6

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1. 1/

   `A = (-3  +6) . (-4) – 12`

   `A = 3 . (-4) – 12`

   `A = -12 – 12`

   `A = -24.`

   `B = 3/5 + `$\dfrac{-7}{10}$`.(-2) `

   `B = 3/5 + 7/5`

   `B = 10/5`

   `B = 2.`

   2/

   `2x = 3/4 – 5/6`

   `2x = 18/24 – 20/24`

   `2x = ` $\dfrac{-1}{12}$

   `x = `$\dfrac{-1}{12}$` : 2`

   `x = `$\dfrac{-1}{12}$` . 1/2`

   `x = `$\dfrac{-1}{24}$.

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2. A=(-3+6).(-4)-12

     = 3 . (-4)- 12

     = -12 – 12

     = -24

   B=3/5+-7/10.(-2)

     = 3/5 + 7/5

     = 2

   Tìm x:

       2.x= 3/4-5/6

   ⇒ 2x = 9/12 – 10/12

   ⇒ 2x = -1/12

   ⇒  x  = -1/24

        

    

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