2) No caderno, calcule o valor das expressões a) (13+2)x3+5 b) (7+2)x(3-1) c)(4+2x5)-3 d) 20-(15+6:3) e) 15+[6+(8-4:2)] f) 40-[3+(10-2):2] g) (30+2x(5-3)]x2-10 h) 10+[4+(7x3+1)]-3 i) (3+2)x(5-1)+4
Soluções para a tarefa
a) (13 + 2) × 3 + 5
15 × 3 + 5
45 + 5
50
b) (7 + 2) × (3 - 1)
9 × 2
18
c)(4 + 2 × 5) - 3
(4 + 10) - 3
14 - 3
11
d) 20 - (15 + 6 : 3)
20 - (15 + 2)
20 - 17
3
e) 15 + [6 + (8 - 4 : 2)]
15 + [ 6 + (8 - 2)]
15 + [6 + 6]
15 + 12
27
f) 40 - [3 + (10 - 2) : 2]
40 - [3 + 8 : 2]
40 - [3 + 4]
40 - 7
33
g) [30 + 2 × (5 - 3)] × 2 - 10
[30 + 2 × 2] × 2 - 10
[30 + 4] × 2 - 10
34 × 2 - 10
68 - 10
58
h) 10 + [4 + (7 × 3 + 1)] - 3
10 + [4 + (21 + 1)] - 3
10 + [4 + 22] - 3
10 + 26 - 3
36 - 3
33
i) (3 + 2) × (5 - 1) + 4
5 × 4 + 4
20 + 4
24