33 /Effectuer les sommes suivantes sans utiliser la calculatrice. a. (+5)+(+7) c. (+15) + (-6) e. (+5) + (-12) g. (-8) + (+8) i. (-9) + (-6) b. (-10)+(-3) d. (-8) + (+5) f. (−12)+(+17) h. (+14) + (+13) j. (+15) + (-15)​
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