Bonsoir, pouvez vous m'aider à développer ces calculs s'il vous plaît : A= (2x-3) (2x+3)
B= (x+1)² + 7x (2-x)
C= (x+3) (2x-1) -3x (2x+5)
D= (4t+1) (4t-1) - (3t+2)²
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