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Sagot :

Réponse :

Bonsoir;

Explications étape par étape

a)  (+3) + (-7) +(+5) -(-1) =  

     +3 -7 +5 +1 = +9 -7 = +2

b)  (+3) -(-7) -(+5) +(-1) =

+3 +7 -5 -1 = +10 -6 = +4

c) (+3) +(-7) -(+5)  - ( -1) =

+3 -7 -5 +1 =  -12 +4 = -8

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