Bonjour 1-developper et simplifier
A=(2x+1)^2-(3x+5)(3x-5)
B=(7-2x)^2+4x(1-x)
2-factoriser ce qui suit
C=25x^2-4+(5x^2)(2x+7)
D=9x^2-6x+1-5(3x-1)
merci d'avance ​
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