27/23 - -5/21 - 4/23 + 16/21 + 1/2

2 câu trả lời

`27/23 - -5/21 - 4/23 + 16/21 + 1/2`

`= 27/23 + 5/21 - 4/23 + 16/21 + 1/2`

`= (27/23 - 4/23) + (5/21 + 16/21) + 1/2`

`= 23/23 + 21/21 + 1/2`

`= 1 + 1 + 1/2`

`= 2 + 1/2`

`= 4/2 + 1/2`

`= 5/2`

Đáp án:

 `5/2`

Giải thích các bước giải:

    `27/23-((-5)/21) - 4/23 +16/21 + 1/2 `

`= 27/23 + 5/21-  4/23+ 16/21 + 1/2`

`= (27/23 - 4/23) + (5/21 + 16/21) + 1/2`

`= 1 + 1 + 1/2`

`= 2 + 1/2`

`=4/2 + 1/2`

`=5/2`