Bonjour de l'aide svp ( les x ne sont pas un signe de multiplication mais la lettre x)
a= 4x² +4
b= (7x+2)² -2x(7x+2)
c= 9y² +6y+1
d= 25x² - (2x+1)²
e= (4x-1)(2-x)-(2-x)(8-3x)

Merci pour votre aide
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