Respostas
Resposta:
Explicação passo-a-passo:
3 – Calcule o valor das expressões:
a) − [−(−8)]
= - [+8]
= - 8
_______
B) − [−(−6 + 9)]
= - [ - (3)]
= - [-3]
= 3
___________
C) − 10 + 7 + [−(−9)]
= - 3 + 9
= 6
____________
D) (−5) + [−(−4)]
= - 5 + 4
= - 1
__________
E) − [−(2 + 4)]
= - [ - (6)]
= 6
_______
F) − [10 + (−8)]
= - [ 10 - 8]
= - [ 2]
= - 2
_____________
G) 0—4 − 8+3
= - 4 - 5
= - 9
_______
ℎ)
= − [−2—1 − 3]
= - [ - 6]
= + 6
_________
I) − 3 − [−(−4 + 5)]
= - 3 - [ -(1)]
= - 3 + 1
= - 2
___________
J) − [(−1 + 3) − 4]
= - [ 2 - 4]
= - [ - 2]
= + 2
_____________
K) − [−2—7 −1]
= - [ - 10]
= + 10
________
L) − [−3 − 8 − (5 + 4)]
= - [ - 11 - (9)]
= - [ - 11 - 9]
= - [ - 20]
= 20
__________
M) (10 − 2) − 3 + (8 + 7 − 5)
= 8 - 3 + (15-5)
= 5 + 10
= 15
__________
N) 15 + [−4—2 + 7]
= 15 + [ - 6 + 7]
= 15 + 1
= 16
_________
O) − 4 + [−5 − (+2 − 1) + 1]
= - 4 + [ - 5 - 1 + 1]
= - 4 + [-5]
= - 4-5
= - 9
_____________
P) 4 − 7 − [−10 + (5 − 2) + 4]
= - 3 - [ - 10 + 3 + 4]
= - 3 - [ - 10 + 7]
= - 3 - [ - 3]
= - 3 + 3
= 0
___________
Q) − 10 + [2 − 1 + (−20 + 4)]
= - 10 + [ 1 + (-16)]
= - 10 + [ 1 - 16]
= - 10 - 15
= - 25
___________
R) 25—5 − (2 − 5 − 1) + 3 +9
= 20 - (2 - 6) + 12
= 32 - (-4)
= 32 + 4
= 36
__________
S) 20 − 4 − [4—6 + 10]
= 16 - [-2+10]
= 16 - [8]
= 8
________
T) + 2 + {+8—5 − (+7 − 2) −7}
= 2 + {3 - 5 - 7}
= 2 + {3 - 12}
= 2 - 9
= - 7
____________
U) 25 − [8 − 6 + [9 − (4 − 2) − 5]}
= 25 - { 2 + [9 - (2) - 5]}
= 25 - { 2 + [9-2-5]}
= 25 - {2 + [9-7]}
= 25 - {2+2}
= 25 - 4
= 21
____________
V) − 65 − [−20 + 5—15 + 5 +40]
= - 65 - [ - 15 - 10 + 40]
= - 65 - [ - 25 + 40]
= - 65 - [ 15]
= - 65 - 15
= - 80
______________
W) 25 − {−8 − [3 + (−6 − 2) + 5]}
= 25 - { - 8 - [3 - 8 + 5]}
= 25 - { - 8 - [-5+5]}
= 25 - { - 8 - 0}
= 25 - {-8}
= 25 + 8
= 33
_____________
X) 16—3 +[−4 + 2—12 + 2]
= 13 + [-2 - 10]
= 13 - 12
= + 1
____________
Y) − 35 + {7 + [−12—18 + 2 − 1] −16}
= - 35 + {7+[-30+1] - 16}
= - 35 + {7-29-16}
= - 35 + {7 - 45}
= - 35 - 38
= - 73