A] 7+[7/12 - 1/2 +3]-[1/12+5] B]1-{1:[2^3 +1-(-1/2^2)]}

`a) 7 + (7/12 - 1/2 + 3) - (1/12 + 5)`

`= 7 + (7/12 - 6/12 + 36/12) - (1/12 + 60/12)`

`= 7 + 37/12 - 61/12`

`= 84/12 + 37/12 - 61/12`

`= 60/12 = 5`

`------------`

`b) 1 - {1 : [2^3 + 1 - (- 1/2^2)]}`

`= 1 - [1 : (8 + 1 + 1/4)]`

`= 1 - [1 : (32/4 + 4/4 + 1/4)]`

`= 1 - (1 : 37/4)`

`= 1 - 4/37`

`= 33/37`

$# 𝓖𝓻𝓮𝓮𝓷$