Đáp án:

`a) (-2/3)^2 . 5/13 - 8/13 : (-2,25) - (-1)^2015`

`= 4/9 . 5/13 - 8/13 : (-9/4) + 1`

`= 20/117 + 32/117 + 1`

`= 4/9 + 1`

`= 13/9`

`b) (9^9 . 4^10)/(8^8)`

`= ((3^2)^9 . (2^2)^10)/((2^3)^8)`

`= (3^18 . 2^20)/(2^24)`

`= (3^18)/(2^4)`

`c) 5/8 : (-12/18 + 3/10 - 5/8 : (-7/2) + 3)`

`= 5/8 : (-2/3 + 3/10 + 5/28 + 3)`

`= 5/8 : (-11/30 + 5/28 + 3)`

`= 5/8 : (-79/420 + 3)`

`= 5/8 : 1181/420`

`= 525/2362`

`d) 2^2 + 3 . (1/9)^0 - 1/2^2 . 4 + ((-2)^2 : 1/2) . 8`

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

`= 7 - 1 + 8 . 8`

`= 6 + 64`

`= 70`