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bonjour

identité remarquable

( x+ 5 )² = x² + 10 x +25

( x - 5 ) ² = x² - 10 x + 25

( y + 3 ) ( y - 3 ) = y² - 9

( 4 x + 6 )² = 16 x²² + 48 x + 36

( 3 x -7 )² = 9 x²  - 42 x + 49

( 2 x + 5 ) ( 2 x - 5 ) = 4 x² - 25

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