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Sagot :

a= 5x-4+7x-8x+6
  =4x+2
b= -4y+5-2y²+y-8y²-3y-11
  =-10y²-6y-6
A= 5x-4+7x-8x+6
=4x+2
B=-4y+5-2y²+y-8y²-3y-11
=-10y²-6y-6

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