Réponse:
A=2x × 5x + 2x × (-7) + 3x × 9x + 3x + 4
A= 10x² - 14 + 27x² + 12
B=3×4×x×x-5×3
B=3x(4-5)
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Réponse:
A=2x × 5x + 2x × (-7) + 3x × 9x + 3x + 4
A= 10x² - 14 + 27x² + 12
B=3×4×x×x-5×3
B=3x(4-5)