Bonsoir j'aimerais de l'aide pour ces trois calculs
Il faut développer réduire et ordonner ces expressions:
A=(3x+5)^{2} -(5x-4)^{2}
B=(2x-7)^{2} -(2x-7)(3x+5)
C=(\frac{5}{2}x+2)^{2} +(\frac{5}{2}x-2)^{2}-(\frac{5}{2}x+2)(\frac{5}{2}x-2)
Merci d'avance
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