`2)`
`a) -3/5 - x = -0,75`
`-3/5 - x = -3/4`
`x = -3/5 - (-3/4)`
`x= 3/20`
Vậy `x = 3/20`
`b) x + 1/3 = 2/5 - (-1/3)`
`x + 1/3 = 11/15`
`x = 11/15 - 1/3`
`x = 2/5`
Vậy `x = 2/5`
`c) 2 1/2 - x + 4/5 = 2/3 - (-4/7)`
`5/2 - x = 26/21 - 4/5`
`5/2 - x = 46/105`
`x = 5/2 - 46/105`
`x = 433/210`
Vậy `x = 433/210`
`d) 1 4/5 = -0,15 - x`
`9/5 = -3/20 - x`
`9/5 + 34/20 = -x`
`39/20 = -x`
`x = -39/20`
Vậy `x = =39/20`
`e) -4/7 - x = 3/5 - 2x`
` -4/7 - x + 2x = 3/5`
`x ( -1 + 2) = 3/5 + 4/7`
`x = 41/35`
Vậy `x = 41/35`
`f) ( 3/9 - 1/5) + ( 5/8 - x) = 1/5`
`7/40 + ( 5/8 - x) = 1/5`
`( 5/8 - x) = 1/5 - 7/40`
`5/8 - x = 1/40`
`x = 5/8 - 1/40`
`x = 3/5`
Vậy `x = 3/5`
`2)`
`1/2 - ( 1/3 + 3/4) ≤ x ≤ 1/24 - ( 1/8 - 1/3)`
`= -7/12 ≤ x ≤ 1/4`
Vì `x∈ ZZ` nên `x = 0`
