1/2x-3/4=-1 1/4 3/2-1/2:x=5/4 1/3+2/3.x+-7

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1. Đáp án:

     $\text{$\dfrac{1}{2}$x – $\dfrac{3}{4}$ = $\dfrac{-11}{4}$}$

   $\text{<=> $\dfrac{1}{2}$x = $\dfrac{-11}{4}$ + $\dfrac{3}{4}$ }$

   $\text{<=> $\dfrac{1}{2}$x= -2 }$

   $\text{<=> x = -2 : $\dfrac{1}{2}$ }$

   $\text{<=> x =-4 }$

   $\text{Vậy x = -4}$

   $\text{ $\dfrac{3}{2}$ – $\dfrac{1}{2}$ : x = $\dfrac{5}{4}$  }$

   $\text{<=> $\dfrac{-1}{2}$ : x = $\dfrac{5}{4}$ – $\dfrac{3}{2}$ }$

   $\text{<=> $\dfrac{-1}{2}$ : x =$\dfrac{-1}{4}$ }$

   $\text{<=> x = $\dfrac{-1}{2}$ : $\dfrac{-1}{4}$ }$

   $\text{<=>x = 2 }$

   $\text{ Vậy x= 2 }$

   $\text{$\dfrac{1}{3}$ + $\dfrac{2}{3}$x -7 =0}$

   $\text{<=> $\dfrac{2}{3}$x = 7 – $\dfrac{1}{3}$ }$

   $\text{<=> $\dfrac{2}{3}$x = $\dfrac{20}{3}$ }$

   $\text{<=> x =  $\dfrac{20}{3}$ : $\dfrac{2}{3}$ }$

   $\text{<=> x = 10 }$

   $\text{Vậy x= 10  }$

    

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2. Bạn tham khảo :

   1/2x – 3/4 = -1 1/4 

   ⇒ 1/2x = -1 1/4 +3/4

   ⇒ 1/2x = -1 . 1$

   ⇒  1/2x = (-1)

        x = -1 : 1/2

        x = 1/-2 

   3/2 -1/2 : x = 5/4

   1/2 : x = 3/2 – 5/4

   1/2: x = 1/4

   x = 1/2 : 1/4

   x = 2 

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