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Sagot :

Bonjour,

Méthode 1:

Factoriser:

a= 14x12-18x12= 12(14-18)= 12(-4)= -48

b=25x15+15x35= 15(25+35)= 15(60)= 900

Méthode 2:

a= (14x12)- (18x12)= ...-...= ...  utilise la calculette

b= (25x15) + (15x35)= ... + ...= ...

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