2)Tính: a)1/3+(-2/3)^2+-8/9 b)(1/3)^3.9/4-(-1/2)^2 c)5/2-3+(-1/2)^2 d)(-1/7)^0-2 và 4/9+(-2/3)^2 e)3:(-3/2)^2+1/9.6 f)1/2-(2/3)^8:(4/9)^3+5/6

`a)` `1/3+(-2/3)^2+(-8)/9`

`= 1/3+4/9-8/9`

`= 3/9+4/9-8/9`

`= -1/9`

`b)` `(1/3)^3 . 9/4 - (-1/2)^2`

`= 1/27 . 9/4 - 1/4`

`= 1/3 . 1/4 - 1/4 . 1`

`= 1/4 . (1/3 - 1)`

`= 1/4 . (1/3 - 3/3)`

`= 1/4 . (-2/3)`

`= 1/2 . (-1/3)`

`= -1/6`

`c)` `5/2-3+(-1/2)^2`

`= 5/2-3+1/4`

`= 10/4-12/4+1/4`

`= -1/4`

`d)` `(-1/7)^0-2 4/9+(-2/3)^2`

`= 1-22/9+4/9`

`= 9/9-22/9+4/9`

`= -9/9`

`= -1`

`e)` `3:(-3/2)^2+1/9 . 6`

`= 3:9/4+6/9`

`= 3 . 4/9+6/9`

`= 12/9+6/9`

`= 18/9`

`= 2`

`f)` `1/2-(2/3)^8:(4/9)^3+5/6`

`= 1/2-256/6561:64/729+5/6`

`= 1/2-256/6561 . 729/64+5/6`

`= 1/2-4/9 . 1/1+5/6`

`= 1/2-4/9+5/6`

`= 9/18-8/18+15/18`

`= 16/18`

`= 8/9`