Đáp án+Giải thích các bước giải:
`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`
`-> 6/12-4/12-3/12 < x <1/48-3/48+8/48`
`-> -1/12 < x < 6/48`
`-> -0,08(3) < x< 0,128`
mà `x ∈ ZZ`
`->x=0`
Vậy `x=0`
`b)1/4+8/9 ≤ x/36 < 1-(3/8-5/6)`
`-> 9/36+32/36 ≤ x/36 < 24/24-(9/24-20/24)`
`-> 41/36 ≤ x/36 < 35/24`
`-> 82/72 ≤ (2x)/72 < 105/72`
`-> 82 ≤ 2x < 105`
`-> 41 ≤ x < 52,5`
Vì `x ∈ ZZ`
`->x ∈{41;42;43;44;45;46;47;48;49;50;51;52}`
Vậy `x ∈{41;42;43;44;45;46;47;48;49;50;51;52}`
