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factoriser en utilisant les identités remarquables :
E = ( 9x² -1 ) + 3x - 1
factoriser en utilisant les identités remarquables :
E = ( 9x² -1 ) + 3x - 1
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E=(9x^2-1)+(3x-1)E=(3x-1)(3x+1)+(3x-1)
E=(3x-1)(3x+1+1)
E=(3x-1)(3x+2)
E = (3x-1)(3x+1) +(3x-1)
e = (3x-1)(3x+1 +1)
E = (3x-1)(3x+2)