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Sagot :

Salut x+2X2x-2X-3-x+1Xx-1X2 =x+4x-6-x+2x-2 =6x+4
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[(x+2)(2x-3)]-[(x+1)(x-2)]

=(2x²-3x+4x-6)-(x²-2x+x-2)

=2x²+x-6-x²+2x-x+2

=x²+2x-4

 

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