Đáp án`+`Giải thích các bước giải:

 `0,(3) +0,8 :{[2,4 -6:(-1 +2^8 :4^3) ] . 3/2-2}`

`= 1/3 + 4/5 :{[ 12/5 - 6:(-1 + 2^8 :(2^2)^3) ] . 3/2 -2}`

`= 1/3 +4/5 :{[12/5 - 6:(-1 + 2^8 : 2^6)] . 3/2 -2}`

`= 1/3 +4/5 :{[12/5 -6:(-1 + 2^2)] . 3/2 -2}`

`= 1/3 + 4/5:{[12/5 -6: (-1 +4)] . 3/2 -2}`

`=1/3 +4/5 :{[12/5 - 6: 3 ] . 3/2 -2}`

`=1/3 +4/5:{[12/5 - 2] . 3/2 -2}`

`= 1/3 + 4/5: {2/5 . 3/2 -2}`

`=1/3 + 4/5:{ 3/5 -2}`

`=1/3 + 4/5 :(-7/5)`

`=1/3 -4/7`

`=-5/21`