1.Tính:

a) 5-16/21*35/48*6

b)17/18+16/3:8*5/6

c)3:4/3-77/12:11

`\color{#B9D3EE}{\text{#}}\color{#9FB6CD}{\text{Y}}\color{#6C7B8D}{\text{u}}\color{#696969}{text{u}}\color{#828282}{\text{k}}\color{#b5b5b5}{\text{a}\color{#B9D3EE}{\text{i}}\color{#9C9C9C}`

`1.`

`a)` `5 - 16/21 × 35/48 × 6`

`=`  `5 - 1/3 × 5/3 × 6`

`=`  `5 - 5/9 × 6`

`=` `5 -10/3`

`=` `15/3 - 10/3`

`=` `5/3`.

`b)` `17/18 + 16/3 : 8 × 5/6`

`=` `17/18 + 16/3 × 1/8 × 5/6`

`=` `17/18 + 2/3 × 1/1 × 5/6`

`=` `17/18 + 2/3 × 5/6`

`=` `17/18 + 1/3 × 5/3`

`=`  `17/18 + 5/9`

`=` `17/18 + 10/18`

`=` `27/18`

`=` `3/2`.

`c)` `3 : 4/3 - 77/12 : 11`

`=` `3 . 3/4 - 77/12 . 1/11`

`=` `9/4 - 7/12 . 1/1`

`=` `9/4 - 7/12`

`=` `27/12 - 7/12`

`=` `20/12`

`=` `5/3`.