Question

Answer 1

Bài `1`

`a, (-12/16 + 7/14) - (1/13 - 3/13)`

`= (-3/4 + 1/2) - (-2)/13`

`= -1/4 + 2/13`

`= -13/52+8/52`

`= -5/52`

`b, 10/11  + 4/11 : 4 - 1/8`

`= 10/11  + 1/11 - 1/8`

`= 1 - 1/8`

`= 7/8`

`c, 2,86 . 4 + 3,14 . 4 - 6,01 . 5 + 3^2 . 0,75`

`= 4 . (2,86 + 3,14) - 30,05 + 9 . 0,75`

`= 4 . 6 - 30,05 + 6,75`

`= 24 - 23,3`

`= 0,7`

Answer 2

Bài `2`

`a, 1/5 - x = -1/3`

`=> x = 1/5 - (-1/3)`

`=> x = 1/5 + 1/3`

`=> x = 8/15`

Vậy: `x = 8/15`