Question

resolva as expressões:

1) (17 + 9) - 8 - (11 + 4)
2) 90 - [25 + (5 . 2 - 1) +3]
3) ( - 3 + 5 + 2) : ( -2)
4) (3 - 2 . 9) : (- 5) : ( - 3)

Answer 1

Olá

Vamos lá,

1) (17 + 9) - 8 - (11 + 4) 
= 26 - 8 - 15
= 3
2) 90 - [25 + (5 . 2 - 1) +3]
= 90 - [25 + (10 - 1) +3]
= 90 - [25 + 9 +3]
= 90 - 37
= 53
3) ( - 3 + 5 + 2) : ( -2)
= 4 : -2
= - 2 
4) (3 - 2 . 9) : (- 5) : ( - 3)
= (3 - 18) : (-5) : ( -3)
= -15 : - 5 : - 3
= 3 : -3
= -1