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Sagot :

VINS

bonjour

aire  = ( x + 1 ) ( x + 3 )

= x² + 3 x + x + 3

= x² + 4 x + 3

x ( x + 3)  + x ( x + 3)

=  x² + 3 x + x + 3 = x² + 4 x + 3

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