Question

determine o valor de cada soma algébrica: a)6+(-9+1) b)8-(-6+10) c)-10+(6-4) d)2+(2+5-7) e)-5+(2-4)-(7-1) f) (-5+3)-(5-9)+(8-1)-11

Answer 1

a)
= 6 + (- 9 + 1)
= 6 + (-8)
= 6 - 8
= - 2

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b)
= 8 - (- 6 + 10)
= 8 - ( 4)
= 8 - 4
= 4

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c)
= - 10 + (6 - 4)
= - 10 + 2
= - 8

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d)
= 2 + (2 + 5 -7)
= 2 + ( 7 - 7)
= 2 + 0
= 2

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e)
= - 5 + (2 - 4) - (7 - 1)
= - 5 + (-2) - (6)
= - 5 - 2 - 6
= - 7 - 6
= - 13

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f)
= (- 5 + 3) - (5 - 9) + (8 - 1) - 11
= - 2 - ( - 4) + 7 - 11
= - 2 + 4 - 4
= - 2 + 0
= - 2

Answer 2

a) 6 + (- 9 + 1)
6 + (-8)
6 - 8
- 2


b) 8 - (- 6 + 10)
8 - ( 4)
8 - 4
4


c) - 10 + (6 - 4)
- 10 + 2
- 8


d) 2 + (2 + 5 -7)
2 + ( 7 - 7)
2 + 0
2


e) - 5 + (2 - 4) - (7 - 1)
- 5 + (-2) - (6)
- 5 - 2 - 6
- 7 - 6
- 13


f) ( - 5 + 3) - (5 - 9) + (8 - 1) - 11
- 2 - ( - 4) + 7 - 11
- 2 + 4 - 4
- 2 + 0
- 2