Question

47)
a) -6 +8 +6 -4 +4 +1
b) 4 -9 +2 -1 +2 -1 +9 -2
c) 5 +6 -7 +1 +7 -10
d) 12 -6 +5 -5 +6 -12

Answer 1

Respostas:
a) 9
b) 4
c) 2
d) 0
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a)
= - 6 +8 +6 -4 +4 +1
= - 6 + 6 - 4 + 4 + 8 + 1
= 8 + 1 = 9
= 9
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b)
= 4 - 9 +2 - 1 +2 -1 +9 -2
= 4 - 9 + 9 + 2 - 1 - 1 + 2 - 2
= 4
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c)
= 5 + 6 - 7 + 1 + 7 - 10
= 5 + 6 + 1 - 10 + 7 - 7
= 12 - 10 
= 2
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d)
= 12 - 6 + 5 - 5 + 6 - 12
= 12 - 12 - 6 + 6 + 5 - 5
= 0