S justifica.
Francicis de aplicaça?
1. Identifica as propriedades da adica3 em z que
cada uma das seguintes igual dade :
aj (+8)+(-5)]+(+2) =>
d) (-10)+(+3)= (+3)+(-10)=2
C) (-17)40 = 0+(-77) => proprieda de de elemento mentira da adicou
d) (-18)+(+18) =(+78)+(-18) =)​

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