exercice 2
A= (2x-5)²-(3x-1) (2-x)
= 4x²-20x+25-6x+3x²+2+x
= 7x²+7-5
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exercice 2
A= (2x-5)²-(3x-1) (2-x)
= 4x²-20x+25-6x+3x²+2+x
= 7x²+7-5