Question

2. Determine o valor de cada soma
algébrica:
a) 8 - (-6 + 10)
b) –10 + (6 - 4)
c) 2 + (2 + 5 – 7)
d) -5 + (2 – 4) – (7 - 1)
e) (-5 + 3) – (5 – 9) + (8 – 1) – 11​

Answer 1

Resposta:

a) 8 - -6 + 10 = 12

b) –10 + (6 - 4) = -8

c)  2 + (2 + 5 – 7) = 2

d) -5 + (2 – 4) – (7 - 1) = -13

e) (-5 + 3) - (5 - 9) + (8  -  1) - 11 =20

Answer 2

a) 8- (-6 + 10)

= 8 + 6 - 10

= 14 -10

= 4

b) -10 + (6-4)

= -10 +6 -4

= -4 -4

= -8

c) 2+ (2+5-7)

2 +2 +5 -7

4 + 5 - 7

9 - 7

= 2

d) -5 + (2-4) - (7-1)

-5 +2 -4 -7 +1

-3 -4 -7 +1

- 14 +1

= -13

e) (-5 +3) - (5-9) + (8-1) - 11

-5 +3 -5 +9 + 8 - 1 - 11

- 2 - 5 + 17 - 12

- 7 + 17 - 12

10 - 12

= - 2