Question

Calcule as expressões numéricas:


(a) −[−3 + 2 − (4 − 5 − 6)]
(b) {−5 + [−8 + 3 × (−4 + 9) − 3]}
(c) 36 + 2 × {25 + [18 − (5 − 2) × 3]}

Answer 1

a) - [- 3 + 2 - (4 - 5 - 6)]
- [- 3 + 2 - (4 - 11)]
- [- 3 + 2 - (- 7)]
- [- 3 + 2 + 7]
- [- 3 + 9]
- [+ 7]
=> - 6


(b) {- 5 + [- 8 + 3 × (- 4 + 9) - 3]}
{- 5 + [- 8 + 3 × 5 - 3]}
{- 5 + [- 8 + 15 - 3]}
{- 5 + [7 - 3]}
{- 5 + 4}
=> - 1

(c) 36 + 2 × {25 + [18 - (5 - 2) × 3]}
36 + 2 × {25 + [18 - (+ 3) × 3]}
36 + 2 × {25 + [18 - 3 × 3]}
36 + 2 × {25 + [18 - 9]}
36 + 2 × {25 + 9}
36 + 2 × 34
36 + 68
=> 104

Answer 2

(a) −[−3 + 2 − (4 − 5 − 6)]
-[-3 + 2 - ( 4 - 11)]
-[ -1 - (-7)]
-[ -1 +7]
-[+6]
-6


(b) {−5 + [−8 + 3 × (−4 + 9) − 3]}
{−5 + [−8 + 3 × (+5) − 3]}
{−5 + [−8 + 15 − 3]}
{−5 + [+4]}
-1

c) 36 + 2 × {25 + [18 − (5 − 2) × 3]}
36 + 2 × {25 + [18 − (3) × 3]}
36 + 2 × {25 + [18 − (9)]}
36 + 2 × {25 + [+9]}
36 + 2 × {34}
36 + 68
104