Question

resolva as operações abaixo:

a)7- (-8) b) - 8- (-7) c)1- (-2) d)1- (-1) e)1+ (-9) f) (-5) + ( -3) g) 0- (-5) h)0+ (-1)

Answer 1

Sinais iguais = +
Sinais diferentes = -

Sinais iguais = soma
Sinais diferentes = subtrai

a)
7- ( - 8 )

7 + 8 = 15<--------
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b)
- 8 - ( - 7 )

- 8 + 7 = -1<---------
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c)
1- ( - 2 )

1 + 2 = 3<--------
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d)
1 - ( - 1 )

1 + 1 = 2<----------
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e)
1+ ( - 9 )

1 - 9 = - 8<---------------
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f)
( - 5 ) + ( - 3 )

- 5 - 3 = - 8<-----------------
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g)
0- (-5)

0 + 5 = 5 <----------
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h)
0 + ( - 1 )

0 - 1 = -1<------------
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Forte abraço!