`11)`
`a) 17/6 - ( x - 7/6) = 7/4`
`( x - 7/6) = 17/6 - 7/4`
`x - 7/6 = 13/12`
`x = 13/12 + 7/6`
`x = 9/4`
Vậy `x = 9/4`
``
`b) 3/35 - ( 3/5 - x) = 2/7`
`( 3/5 - x) = 3/35 - 2/7`
`3/5 - x = -1/5`
`x = 3/5 - (-1/5)`
`x = 4/5`
Vậy `x = 4/5`
`2)`
`a) 1/2 - ( 1/3 + 1/4) < x < 1/48 - ( 1/16 - 1/6)`
`1/2 - 1/3 - 1/4 < x < 1/48 - 1/16 + 1/6`
`-1/12 < x < 1/8`
`0,083 < x < 0,125`
Mà `x` là số nguyên
⇒ `x = 0`
``
`b) 3/4 - 5/6 ≤ x/12 < 1 - ( 2/3 - 1/4)`
`9/12 - 10/12 ≤ x/12 < 12/12 - 8/12 + 3/12`
`-1/12 ≤ x/12 < 7/12`
Mà `x` là số nguyên
⇒ `x∈ { 0 ; 1 ; 2 ; 3 ; 4 ; 5 ;6 }`
