Question

  Giúp hộ

Answer 1

a) (5/2)² + (-1/2)

= 25/4 - 1/2

= 23/4

b) 3/7 . (-1/9) + 3/7 . (-2/3)

= 3/7 . (-1/9 - 2/3)

= 3/7 . (-7/9)

= -1/3

Answer 2

`#3107.101107`

`3,`

`a)`

`(5/2)^2 + (-1/2)`

`= 25/4 - 1/2`

`= 25/4 - 2/4`

`= 23/4`

`b)`

`3/7 * (1-/9) + 3/7 * (-2/3)`

`= 3/7 * (-1/9 - 2/3)`

`= 3/7 * (-1/9 - 6/9)`

`= 3/7 * (-7/9)`

`= -3/9 = -1/3`