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Sagot :


A= (13-x)(3+x)
A= 39 + 13x - 3x - x²
A= - x² + 10x + 39

B= (x-7)(3x+2)+6(x-7)
B= 3x² + 2x - 21x - 14 + 6x - 42
B= 3x² - 13x - 56

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