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Sagot :

3) F=(4x+1)(2x+3)-(4x+1)(5x-4)

   =(4x+1)(2x+3-5x+4)

   =(4x+1)(-3x+12)

 

4) pour x=7/3 F=(4*7/3+1)*(-3*7/3+12)=155/3

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