Réponse:
a. -8+2-5+9-7 = -6+4-7 = -2-7 = -9
b. -8-5-7+2+9 = -20+11 = -9
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Réponse:
a. -8+2-5+9-7 = -6+4-7 = -2-7 = -9
b. -8-5-7+2+9 = -20+11 = -9