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Sagot :

(2x+1)²-(4x-5)²

(2x)²+2*2x*1+1²-[(4x)²-2*4x*5+5²]

4x²+4x+1-[16x²-40x+25]

4x²+4x+1-16x²+40x-25

-12x²+44x-24

 

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