Aplique a regra de sinais e depois resolva as operações.
Exemplo: (+5) + (-8) = +5 - 8 = -3.
a) ( + 12 ) + ( + 21 ) =
b) ( + 13 ) + ( + 7 ) =
c) ( + 23 ) + ( + 21) =
d) ( – 12 ) + ( – 11 ) =
e) ( – 23 ) + ( – 4 ) =
f) ( – 21 ) - ( – 12 ) =
g) ( + 10 ) - ( – 13 ) =
h) ( + 21 ) - ( – 23 ) =
i) ( + 40 ) - ( – 17 ) =
j) ( + 30 ) – ( + 20) =
Questão 3
Aplique a regra de sinais e resolva.
Exemplo: (-3) + (-5) - (-9) = - 3 - 5 + 9 = - 8 + 9 = 1
a) ( + 3 ) + ( – 2 ) + ( – 5 ) =
b) ( – 2 ) – ( + 1 ) – ( + 5 ) =
c) ( + 4 ) + ( – 2 ) – ( + 3 ) =
d) ( + 5 ) – ( – 3 ) – ( – 1 ) =
e) ( + 4 ) + ( – 6 ) – ( + 7 ) – ( – 6 ) + ( + 7 ) =
Questão 4
Elimine os parênteses, aplique a regra de sinais e resolva:
Exemplo: - (-5 + 9) = - (+4) = - 4.
a) + ( – 3 + 8 ) =
b) – ( – 3 + 8 ) =
c) + ( 5 – 6 ) =
d) – ( – 3 – 1 ) =
e) – ( – 6 + 4 – 1 ) =
f) – ( – 3 + 2 ) =
g) – ( – 5 – 2 – 3 ) =
h) – ( – 6 + 8 – 1 ) =
i) – ( – 12 + 14 ) =
j) + ( – 5 – 6 + 3 ) =
Soluções para a tarefa
Resposta:
Questão 2 :
A) ( + 12 ) + ( + 21 ) = 33
12 + 21 = 33
B) ( + 13 ) + ( + 7 ) = 20
13 + 7 = 20
C) ( + 23 ) + ( + 21) = 44
23 + 21 = 44
D) ( – 12 ) + ( – 11 ) = - 23
- 12 - 11 = - 23
E) ( – 23 ) + ( – 4 ) = - 27
- 23 - 4 = - 27
F) ( – 21 ) - ( – 12 ) = - 9
- 21 + 12 = - 9
G) ( + 10 ) - ( – 13 ) = 23
10 + 13 = 23
H) ( + 21 ) - ( – 23 ) = 44
21 + 23 = 44
I) ( + 40 ) - ( – 17 ) = 57
40 + 17 = 57
J) ( + 30 ) – ( + 20) = 10
30 - 20 = 10
Questão 3
A) ( + 3 ) + ( – 2 ) + ( – 5 ) = - 4
3 - 2 - 5
1 - 5 = - 4
B) ( – 2 ) – ( + 1 ) – ( + 5 ) = - 8
- 2- 1 - 5
- 3 - 5 = - 8
C) ( + 4 ) + ( – 2 ) – ( + 3 ) = - 1
4 - 2 - 3
2 - 3 = - 1
D) ( + 5 ) – ( – 3 ) – ( – 1 ) = 9
5 + 3 + 1
8 + 1 = 9
E) ( + 4 ) + ( – 6 ) – ( + 7 ) – ( – 6 ) + ( + 7 ) = 4
4 - 6 - 7 + 6 + 7
- 2 - 7 + 6 + 7
- 9 + 6 + 7
- 3 + 7 = 4
Questão 4
A) + ( – 3 + 8 ) = 5
- 3 + 8 = 5
B) – ( – 3 + 8 ) = - 5
+ 3 - 8 = - 5
C) + ( 5 – 6 ) = - 1
5 - 6 = - 1
D) – ( – 3 – 1 ) = 4
+ 3 + 1 = 4
E) – ( – 6 + 4 – 1 ) = 3
+ 6 - 4 + 1
2 + 1 = 3
F) – ( – 3 + 2 ) = 1
+ 3 - 2 = 1
G) – ( – 5 – 2 – 3 ) = 10
5 + 2 + 3
7 + 3 = 10
H) – ( – 6 + 8 – 1 ) = - 1
6 - 8 + 1
- 2 + 1 = - 1
I) – ( – 12 + 14 ) = - 2
+ 12 - 14 = - 2
J) + ( – 5 – 6 + 3 ) = - 8
- 5 - 6 + 3
- 11 + 3 = - 8
Espero ter ajudado!❤