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Answered

A=(3x+7) (2x+1) + (x+8) (2x+1)

B=(x-3) (2x-7) - (2x-7) (2x-5)

C=(6x-3) (3x-5) - (6x-3)²

factoriser chaque expressions litterales

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A =  ( 2 x + 1 ) ( 3 x + 7 + x + 8 )

  = ( 2 x + 1 ) ( 4 x + 15 )

B = ( 2 x - 7 ) ( x - 3 - 2 x + 5 )

  = ( 2 x - 7 ) ( - x + 2 )

C = ( 6 x - 3 ) ( 3 x - 5 - 6 x + 3 )

  = ( 6 x - 3  ) ( - 3 x - 2 )