a) `|3x + 1/2| - 2/3= 1`
`<=> |3x + 1/2| = 1 + 2/3`
`<=> |3x + 1/2| = 5/3`
`<=> 3x + 1/2 = 5/3` hoặc `3x + 1/2 = -5/3`
`<=> 3x = 5/3 - 1/2` hoặc `3x = -5/3 - 1/2`
`<=> 3x = 7/6` hoặc `3x = -13/6`
`<=> x = 7/6 : 3 = 7/18` hoặc `x = -13/18`
Vậy `x ∈ {7/18 ; -13/18}`
b) `2 2/3 : x = 1 7/9 : 0,02`
`<=> 8/3 : x = 16/9 : 1/50`
`<=> 8/3 : x = 16/9 . 50/1`
`<=> 8/3 : x = 800/9`
`<=> x = 8/3 : 800/9`
`<=> x = 3/100`
Vậy `x = 3/100`
$#Minh$
