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Sagot :

B=2-3x(3x-2)-(-2x+x^2+10-5x)
=2-9x^2-6x+2x-x^2-10+5x
=-10x^2+x-8
B=2-9x^2+6x-[-2x+x^2+10-5x]
=2-9x^2+6x+2x-x^2-10+5x
=13x-10x^2-8

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