Pour les deux exercices, développer chaque expression en utilisant une identité remarquable. 18)

a) (x + 3)²
b) (x + 6)²
c) (3x + 2)²
d) (1 + 5a)²

19)

a) (x - 4)²
b) (x - 5)²
c) (5x - 1)²
d) (10 - 3x)²
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