Đáp án+Giải thích các bước giải:

 Ta có:

`1)`

`(2/3)^2 = 2/3 . 2/3 = 4/9`

`2)`

`(2/3)^3 = 2/3 . 2/3 . 2/3 = 8/27`

`3)`

`(- 1/3)^3 = ( - 1/3) . ( - 1/3) . ( - 1/3) = - 1/27`

`4)`

`(- 3/4)^2 = (- 3/4) . ( - 3/4)  = 9/16`

`5)`

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

`6)`

`((-2)/5)^2 = (- 2/5) . ( - 2/5) = 4/25`

`---------`

Công thức:

`a^0 = 1`

`a^2 = a . a`

`a^3 = a . a . a`