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Sagot :

(5-x)^2+(2x-10)(3x-1)=(5-x)^2-2(-x+5)(3x-1)=(5-x)(5-x-2(3x-1))=(5-x)(5-x-6x+2)=(5-x)(-7x+7)=7(5-x)(1-x)
(5 - x)² + (2x - 10)(3x - 1)
= (5 - x)(5 - x) + (2x - 10)(3x - 1)
= (5 - x)(5 - x) + 2(5 - x)(3x - 1)
= (5 - x)[5 - x + 2(3x - 1)]
= (5 - x)(5 - x + 6x - 2)
= (5 - x)(5x + 3)

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