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Sagot :

VINS

bonsoir

voir COURS

x² - 81 = ( x - 9 ) ( x + 9 )

49 x² - 4 = ( 7 x - 2 ) ( 7 x + 2 )

64 x² - 1 = ( 8 x - 1 ) ( 8 x + 1 )

9 - 16 x² = ( 3 - 4 x ) ( 3 + 4 x )

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