1)3 1/2 – 1/2 . x= 2/3 2) 1/4 + 1/3 : (2x -1)= -1 giúp tuii

2 bình luận về “1)3 1/2 – 1/2 . x= 2/3 2) 1/4 + 1/3 : (2x -1)= -1 giúp tuii”

1. a)3+1/2-1/2.x=2/3

   3+1/2(x-1)=2/3

   =>(2/3-3):1/2=x-1

   =>x-1=-14/3

   Vậy x=-11/3

   b)1/4+1/3:(2x-1)=-1

   1/3:(2x-1)=(-1)-1/4

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

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

   2x-1=-1/60

   =>2x=59/60

   =>x=59/120

   Vậy x=59/120

   @lienlien55098

    

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2. Giải đáp + Lời giải và giải thích chi tiết:

   1) 31/2 – 1/2 . x = 2/3

   7/2 – 1/2 . x = 2/3

   1/2 . x = 7/2 – 2/3

   1/2 . x = 21/6 – 4/6

   1/2 . x = 17/6

   x = 17/6 : 1/2

   x = 17/6 . 2

   x = 17/3

   Vậy x = 17/3

   2) 1/4 + 1/3 : ( 2x – 1 ) = -1

   1/3 : x ( 2x – 1 ) = -1 – 1/4

   1/3 : ( 2x – 1 ) = -4/4 – 1/4

   1/3 : ( 2x – 1 ) = -5/4

   2x – 1 = 1/3 : -5/4

   2x – 1 = 1/3 . -4/5

   2x – 1 = -4/15

   2x = -4/15 + 1

   2x = -4/15 + 15/15

   2x = 11/15

   x = 11/15 : 2

   x = 11/15 . 1/2

   x = 11/30

   Vậy x = 11/30

                – – -~kid20~- – –

    

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