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Sagot :

Réponse :

Explications étape par étape

Bonsoir

calculer

8+(-3)-(-7)-(-12)

= 8 - 3 + 7 + 12

= 27 - 3

= 24

-11-9+6(-11)-(-13)+7

= -20 - 66 + 13 + 7

= -86 + 20

= -66

5-12-(15-18)

= 5 - 12 - (-3)

= 5 - 12 + 3

= 8 - 12

= (-4)

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