bonsoir
( 5 + 2 x ) ( 5 - 2 x ) = 25 - 4 x² = identité remarquable
( x - 1) ( 2 x + 5 ) = 2 x² + 5 x - 2 x - 5 = 2 x² + 3 x - 5
3 ( x + 6) = 3 x + 18
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bonsoir
( 5 + 2 x ) ( 5 - 2 x ) = 25 - 4 x² = identité remarquable
( x - 1) ( 2 x + 5 ) = 2 x² + 5 x - 2 x - 5 = 2 x² + 3 x - 5
3 ( x + 6) = 3 x + 18