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Sagot :

VINS

bonsoir

identité remarquable =  leçon  

B = 100 - 49 w²

B = ( 10 - 7 w ) ( 10 + 7 w )

C = 4 a² - 20 a + 25

C = ( 2 a - 5 )²  

A = ( 5 x - 7 ) ( 5 x + 7 )

A = 25 x²  - 49

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