J'ai un DM de maths mais je n'ai rien compris pouvez-vous m'aider SVP au plus VITE.  Exercice 1: 
Factoriser:
A=(7x-2)² - (7x-2) (5x+4)
B=(x-8)² - 16
C=(3x-1)² + (9x² - 1) + (x-5) (3x-1)

Exercice 2:
Resoudre:
1. (3x-5) (-7x+2) = 0
2. x² = 16/25

MERCI DE M'AIDER AU PLUS VITE 
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