Ex.9: Les égalités suivantes sont-elles vraies ou fausses ??
a/ (x+3)² = x ² +9
b/ (2x + 1)(2-x) = - 2x² + 3x + 2
c/ (x + 1)(4x + 1) = (x + 1)(3x + 4) + (x + 1)(x − 3)
d/ (4x+3)(1-x) = (1-2x) (2x + 3) + 5x
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