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e. -63: (2-3 x 7 +5 x 2) - 11
f. 48: (2-12:4-7) - 4
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NEMLINELISHEVA

Réponse:

e. -63: (2-3 x 7+5 x 2) - 11

= -63: (2-21+10) -11

= -63: (-19+10) -11

= -63: (-9) -11

= 7-11

= -4

f. 48: (2-12:4-7) - 4

= 48: (2-3-7) - 4

= 48: (-1-7) - 4

= 48: (-8) - 4

= -6-4

= -10

Vérifie quand même si j'ai fait des fautes.