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Sagot :


F = (4x-2) (5-x) - (7- x)(-8 +3x)
= 20x - 4x^2 -10 + 2x - (-56 + 21x + 8x - 3x^2)
= 22x - 4x^2 - 10 + 56 - 29 x - 3x^2
= -7x^2 - 7x + 46

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