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Sagot :

Réponse:

si n=7, on a ¥•÷

A=[(5×7)-10]×7

A=(35-10)×7

A=25×7 ou (35×7)-(10×7)

A=175 ou 245-70=175

B=(4×7)-35

B=28-35

B=-7

-7÷(3×7) → -7/21 → -⅓

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