Đáp án:

`1) -27 . 2,(6)^2 - 4(-1/2)^3`

`= -27 . (8/3)^2 - 4 . (-1/8)`

`= -27 . 64/9 + 1/2`

`= -192 + 1/2`

`= -383/2`

`2) -0,(3)^3 + 8/9 - 26/27`

`= (-1/3)^3 + 8/9 - 26/27`

`= (-1/27) + 8/9 - 26/27`

`= [(-1/27) - 26/27] + 8/9`

`= (-1) + 8/9`

`= -1/9`

`3) 2^3 - 3(1/3)^0 - 1/3^2 + [(-3)^2 : 0,(3)] : 8`

`= 8 - 3 . 1 - 1/9 + [9 : 1/3] : 8`

`= 8 - 3 - 1/9 + 27 : 8`

`= 5 - 1/9 + 27/8`

`= 44/9 + 27/8`

`= 595/72`

`4) 15/7 . [-1/3 . 0,(54)^0 - 1/8] - 2 1/7 . (-1/2)^3`

`= 15/7 . [-1/3 . 1 - 1/8] - 15/7 . (-1/8)`

`= 15/7 . [-1/3 - 1/8] + 15/56`

`= 15/7 . (-11/24) + 15/56`

`= (-55/56) + 15/56`

`= -5/7`