`1)`
`a) 5/3 + (-8)/3 : ((-4)/9)`
`= 5/3 + 6`
`= 23/3`
``
`b) 1/9 + 7/3 - ( 10/3 + 1/9)`
`= 1/9 + 7/3 - 10/3 - 1/9`
`= (1/9 - 1/9) + ( 7/3 - 10/3)`
`= 0 + (-1)`
`= -1`
``
`2)`
`a) 29/4 x + 7/6 = 5/4`
`29/4 x = 5/4 - 7/6`
`29/4 x = 1/12`
`x = 1/12 : 29/4`
`x =1/87`
Vậy `x = 1/87`
``
`b) 1/3 . ( 3x - 2) + 25% = -9/6`
`1/3 . 3x - 1/3 . 2 = -9/6 - 25%`
`1/3 . 3x - 2/3 = -7/4`
`1/3 . 3x = -7/4 + 2/3`
`1/3 . 3x = -13/12`
`3x = -13/12 : 1/3`
`3x = -13/4`
`x = -13/4 : 3`
`x = -13/12`
Vậy `x = -13/12`
