Question

Bài 1:

Tìm X:

A) 2/3 - X - 1/5 = 2/5 - 1/7

b) 1/2 x X : 2/3 = 1 2/5

c 2/5 x X +X x 1/5 = 2/7

Answer 1

A) 2/3 - x - 1/5 = 2/5 - 1/7

   2/3 - x - 1/5 = 9/35

   2/3 - x = 9/35 + 1/5

   2/3 - x = 16/35

   x = 2/3 - 16/35 = 22/105

B) 1/2 x X : 2/3 = 1 2/5

    1/2 x X : 2/3 = 7/5

    1/2 x X = 7/5 x 2/3

   1/2 x X = 14/15

   X =14/15 : 1/2 

   X = 28/15

C) 2/5 x X + X x 1/5 = 2/7

   X x ( 2/5 + 1/5 ) = 2/7

  X x 3/5 = 2/7

  X = 2/7 : 3/5 = 10/21

Answer 2

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