Bài `1:`
`c) (-2)^3 . (3/4 - 0,25) : (2 1/4 - 1 1/6)`
` = -8 . 1/2 : 13/12`
` = -4 . 12/13`
` = -48/13`
`d) 125% . ( -1/2)^2 : (1 5/16 -1,5) + 2021^0`
` = 5/4 . 1/4 : (-3)/16 + 1`
` = 5/16 . (-16)/3 + 1`
` = -5/3 + 1`
` = -2/3`
Bài `2:`
`c) (10 2/9 + 2 3/5) - 5 2/9`
` = 10 2/9 + 2 3/5 - 5 2/9`
` = (10 2/9 - 5 2/9) + 2 3/5`
` = 5 + 2 3/5`
` = 7 3/5`
` = 38/5`
`h) 4/9 . 19 1/3 - 4/9 . 39 1/3`
` = 4/9. (19 1/3 - 39 1/3)`
` = 4/9 . (-20)`
` = -80/9`
`m) (3/41 -12/47+27/53)/(4/41 -16/47 + 36/53) : (15-15/11+15/121)/(16-16/11 +16/121)`
` = (3.(1/41 -4/47+9/53))/(4.(1/41 -4/47+9/53)) : (15.(1-1/11+1/121))/(16.(1-1/11 +1/121))`
` = 3/4 : 15/16`
` = 3/4 . 16/15`
` = 4/5`
`i) 19 5/8 : 7/12 - 15 1/4 : 7/12`
` = 19 5/8 . 12/7 - 15 1/4 . 12/7`
` = (19 5/8 - 15 1/4) . 12/7`
` = (157/8 - 61/4) . 12/7`
` = 35/8 . 12/7`
` = 15/2`
