04- As expressões a seguir estão escritas na forma simplificada. Calcule o valor de cada
uma.
a) – 7 + 3 – 8 + 4 b) 2 – 9 + 17 + 8 – 25
c) 18 – 9 – 2 + 7 – 1 d) – 57 + 30 – 2 + 41 – 9 + 3
e) 42 – 35 – 10 + 15 – 16 f) 3 – 9 – 7 – 6 + 5 + 8+ 10
Soluções para a tarefa
a) ?– 7 + 3 – 8 + 4 b) 2 – 9 + 17 + 8 – 25
10-8+4 7+17+8-25
2+4= 6 24+8-25
32-25=7
c) 18 – 9 – 2 + 7 – 1 d)? – 57 + 30 – 2 + 41 – 9 + 3
9-2+7-1 27-2+41-9+3
7+7-1 25+41-9+3
14-1=13 66-9+3
57+3=60
e) 42 – 35 – 10 + 15 – 16 f) 3 – 9 – 7 – 6 + 5 + 8+ 10
7-10+15-16 6-7-6+5+8+10
3+15-16 1-6+8+10
18-16=2 0+8+10
8+10=18
A)-8
B)-7
C)13
D)6
E)-4
F)4
Explicação passo a passo
A)-7+3-8+4
-7+3-8+4
-7-8
-(7+8)
-15
-7+3-8+4
-15+3+4
3+4
7
-15+3+4
-15+7
-8
resposta
-8
B)2-9+17+8-25
2-9+17-8-25
2+17+8
2+17
19
2+17+8
19+8
27
2-9+17+8-25
27-9-25
-9-25
-(9+25)
-34
27-9-25
27-34
-7
resposta
-7
C)18-9-2+7-1
18-9-2+7-1
18+7
25
18-9-2+7-1
25-9-2-1
-9-2-1
-(9+2+1)
-12
25-9-2-1
25-12
13
resposta
13
D)-57+30-2+41-9+3
-57+30-2+41-9+3
-57-2-9
-(57+2+9)
-68
-57+30-2+41-9+3
-68+30+41+3
30+41+3
30+41
71
30+41+3
71+3
74
-68+30+41+3
-68+74
6
resposta
6
E)42-35-10+15-16
42-35-10+15-16
42+15
57
42-35-10+15-16
57-35-10-16
-35-10-16
-(35+10+16)
-61
57-35-10-16
57-61
-4
resposta
-4
F)3-9-7-6+5+8+10
3-9-7-6+5+8+10
3+5+8+10
3+5
8
3+5+8+10
8+8+10
8+8
16
8+8+10
16+10
26
3-9-7-6+5+8+10
26-9-7-6
-9-7-6
-(9+7+6)
-22
26-9-7-6
26-22
4
resposta
4