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Sagot :

HIROAB

Réponse:

1) 157 + 100 +81=157+100×5+81×3=157+500+243=900

15 3 5 15+3×5+5×3 15 15

  • x=5--->2x+12=(2×5)+(2×6)=2(5+6)
  • a=5--->a(a-1)=5(5-1)=(5×5)-(5×1)=25-5=20

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