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Sagot :

Bonjour,

A= -5

B= 9-6 =  3

C= 3+4 = 7

D=-12,3 +(-4,7) = -12,3 -4,7 =  -17

E= -2+3 +7 -12 = -4

F= -17 +6+3-8 = -16

-(-) => +

-(+) => -

+(-) => -

+(+) => +

Réponse:

a)12-17=-5

b)9+-6=3

c)3--4=3+4=7

d)-12.3+-4.7=17

e)-2+-3+7+-12=-10

f)-17-(-6-3)-8=-17--9-8=-17+9-8=-16

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