Question

Answer 1

12)

` x + 1/3 = 2/15`

` x = 2/15 - 1/3`

` x = 1/15`

 

` x + 2/3 = 3/4 - 1/6`

` x + 2/3 = 7/12`

` x = 7/12 - 2/3`

` x = -1/12`

Answer 2

bài 2)

` a) x + 7/12 = 17/18 -1/9`

 

` x + 7/12 = 5/6`

` x = 5/6 - 7/12`

` x = 1/4`

 

`b) 29/30 - ( 13/23 +x)  =7/69`

` 13/23 + x = 29/30 - 7/69`

` 13/23 + x = 199/230`

` x = 199/230 - 13/23`

` x = 3/10`