Đáp án `+` Lời giải chi tiết:

`(3/8 + (-3/4) + 7/12) : 5/6 + 1/2`

`= (3/8 - 3/4 + 7/12) : 5/6 + 1/2`

`= (9/24 - 18/24 + 14/24) : 5/6 + 1/2`

`= (5/24) : 5/6 + 1/2`

`= (5/24) × (6/5) + 1/2`

`= 30/120 + 1/2`

`= 1/4 + 1/2`

`= 1/4 + 2/4`

`= 3/4`

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