a) 2x + 1/4 = 3/5 : 7/10 ; b) -3x -7/2 = 14/5 . 10/7 ( dấu . là dấu nhân ) ; c)(1/4 + x).2=1/5 .10/4 ; d) 3/16 – 2x = 1/8 .1

2 bình luận về “a) 2x + 1/4 = 3/5 : 7/10 ; b) -3x -7/2 = 14/5 . 10/7 ( dấu . là dấu nhân ) ; c)(1/4 + x).2=1/5 .10/4 ; d) 3/16 – 2x = 1/8 .1”

1. a, 2x + 1/4 = 3/5 : 7/10

   2x + 1/4 = 3/5 . 10/7

   2x + 1/4 = 6/7

   2x = 6/7- 1/4

   2x = 17/28

   x=17/28:2

   x=17/56

   Vậy x=17/56

   ________________

   b, -3x -7/2 = 14/5 . 10/7

   -3x -7/2 =4

   -3x =4 +7/2

   -3x =15/2

   x=15/2 :-3

   x=-5/2

   Vậy x=-5/2

   ________________

   c,(1/4 + x).2=1/5 . 10/4

   (1/4 + x).2=1/2

   1/4 + x=1/2:2

   1/4 + x=1/4

   x=1/4-1/4

   x=0

   Vậy x=0

   ________________

   d, 3/16 – 2x = 1/8 . 1/2

   3/16 – 2x = 1/16

   2x = 3/16 -1/16

   2x = 1/8

   x=1/8:2

   x=1/16

   Vậy x=1/16

   @Lynacute

   Trả lời
2. a,2x + 1/4 = 3/5 : 7/10
   =>2x + 1/4 = 6/7
   =>2x = 6/7 – 1/4
   =>2x = 17/28
   =>x = 17/28 : 2
   =>x=17/56
   Vậy x=17/56
   b,-3x-7/2 = 14/5 . 10/7
   =>-3x -7/2 = 4
   =>-3x=4+7/2
   =>-3x = 15/2
   =>x = 15/2 : (-3)
   =>x = -5/2
   Vậy x=-5/2
   c,(1/4 + x).2 = 1/5 . 10/4
   =>2(1/4 + x) = 1/2
   =>1/4 + x = 1/2 : 2

   =>1/4 + x = 1/4
   =>x = 1/4 – 1/4
   =>x=0
   Vậy x=0
   d,3/16 – 2x = 1/8 . 1/2
   =>3/16 – 2x = 1/16

   =>2x = 3/16 – 1/16
   =>2x=1/8
   =>x=1/8 : 2
   =>x=1/16
   Vậy x=1/16

   Trả lời