Question

fazer os cálculos:
$( + 9) + ( - 3)$
$- 8 + 10$
$- 7 + 10$
$- 5 - 10$
$+ 30 - 30$
​

Answer 1

+9-+-3 = 6
-8+10= 2
-7+10= 3
-5-10= -15
-30+30= 0

Answer 2

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( + 9) + ( - 3)

9 + (-3)

9-3

6

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- 8 + 10

2

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- 7 + 10

3

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- 5 - 10

-15

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+ 30 - 30

30 - 30

0

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