bài 1:tìm x,y: a)19/20-y=8/3-3/4 b)y:2/3=4/9×3 c)7/9:X=28/15 d3/98 x X=9/10 e)X:12/13=2/5 f)7/8-X=1/2 làm ơn hicc

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1. bài 1 

   a)19/20-y=8/3-3/4

   =19/20-y=23/12

     y=19/20-23/12

   y=-29/30

   b) y : 2/3=4/9 x 3

       y : 2/3 = 4/3

       y          =4/3 x 2/3

       y           =8/9

   c)7/9 : x =28/15

   x=28/15 . 7/9

   x=196/135

   d)3/98 . x =9/10

   x=9/10 : 3/98

   x= 9/10 . 98/3

   x=147/5

   e)x : 12/13=2/5

   x= 2/5 . 12/13

   x= 24/65

   f)7/8 – x = 1/2

   x= 7/8-1/2

   x= 7/8 + -1/2

   x= 7/8 + -4/8

   x= 3/8

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   Trả lời

2. a)19/20-y=8/3-3/4

   19/20-y= 23/12

   y=-29/30

   b)y:2/3=4/9×3

   y:2/3=4/3

   y=8/9

   c)7/9:X=28/15

   x=5/12

   d,3/98 x X=9/10

   x=147/5

   e)X:12/13=2/5

   x=24/65

   f)7/8-X=1/2

   x=3/8

   Trả lời