Recopier et compléter pour développer les expressions suivantes : a) ( x+1 ) ( x+6 ) = x² + ... + ... + ... ;
b) ( x+4 ) ( 2+3x) = 2 ... + ...x² + ... + ... ;
c) ( 3x+1) (2x+1) = 6 ... + ... x + 2 ... + ... ;
d) (x+7) (2x+3) = ... + ... + ... + ... .
b) ( x+4 ) ( 2+3x) = 2 ... + ...x² + ... + ... ;
c) ( 3x+1) (2x+1) = 6 ... + ... x + 2 ... + ... ;
d) (x+7) (2x+3) = ... + ... + ... + ... .
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