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Sagot :

Bonjour,

a)

-17 + 6 = -11

=> -6 +(-11) = -17

b)

15+5 = 20

15 = 20 +(-5)

c)

5+11 = 16

5 = (-11) + 16

d)

9-2 = 7

9+(-7) = 2

a)

(3,5) + ( -11,5) = -8

b)

-5-(-7) = 2

c)

-6 = 3 +(-9)

d)

(+1,7)  = 5-(-2)

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