Đáp án `: a)-119/30`

`b) 45/28`

`c) 1/4`

Giải thích các bước giải:

`a) -2/3 + 75% - 5 1/4 + 2022^0 + \sqrt{0,04}`

`= -2/3+ 3/4 - 21/4 + 1 + 1/5`

`= -2/3 - 9/2 + 1 + 1/5`

`= -20/30 - 135/30 + 30/30 + 6/30`

`= ( -20 - 135 + 30 + 6 )/30`

`= -119/30`

`b) ( \sqrt{9/4} + 1/7 ) : 23/12 + ( -3/2 )^3 . | -2/9 | . ( -1 )^2021`

`= ( 3/2 + 1/7 ) . 12/23 - 27/8 . 2/9 . ( -1 )`

`= ( 21/14 + 2/14 ) . 12/23 + 27/8 . 2/9`

`= 23/14 . 12/23 + 3/4`

`= 6/7 + 3/4`

`= 24/28 + 21/28`

`= 45/28`

`c) ( -1/3 )^2( - \sqrt{81} ) + ( | 4/3 - 1/2 | - 1 1/3 )^2 + ( -2020/2021 )^0`

`= 1/9 . ( -9 ) + ( | 8/6 - 3/6 | - 4/3 )^2 + 1`

`= -1 + ( 5/6 - 4/3 )^2 + 1`

`= 0 + ( 5/6 - 8/6 )^2`

`= ( -1/2 )^2`

`= 1/4`

`#Chank`

`(-2)/3 + 75% - 5 1/4 + 2022^0 + sqrt{0,04}`

`= (-2)/3 + 3/4 - 21/4 + 1 + 0,2`

`= (-2)/3 + 3/4 - 21/4 + 1 + 1/5`

`= (-40)/60 + 45/60 - 315/60 + 60/60 + 12/60`

`= (-40 + 45 - 315 + 60 + 12)/60`

`= (-238)/60`

`= (-119)/30`

_____________________________

`( sqrt{9/4} + 1/7) : 23/12 + (-3)/2^3. |(-2)/9|. (-1)^2021`

`= ( 3/2 + 1/7). 12/23 + (-27)/8. 2/9. (-1)`

`= (21/14 + 2/14). 12/23 + (-3)/4. (-1)`

`= 23/14. 12/23 + 3/4`

`= 12/14 + 3/4`

`= 6/7 + 3/4`

`= 24/28 + 21/28`

`= 45/28`

______________________________

`((-1)/3)^2. (-sqrt{81}) + (|4/3 - 1/2| - 1 1/3)^2 + (-2020/2021)^0`

`= 1/9. (-9) + (|8/6 - 3/6| - 4/3)^2 + 1`

`= (-1) + (|5/6| - 4/3)^2 + 1`

`= (-1) + (5/6 - 4/3)^2 + 1`

`= (-1 + 1) + (-1/2)^2`

`= 0 + 1/4`

`= 1/4`