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gama62
@gama62
January 2021
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bonjour tout le monde j'ai besoin d'un coup de main!!!!
merci d'avance pour votre participation
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aidahakob
1.8x+9+8x-9=16x+18
2.(2x+1)(2x+1)+(5x-7)(5x-7)
4x²+2x+2x+1+25x²+35x-35x+49
29x²+4x+49
3.(2x-1)(2x-1)-(9x-7)(9x-7)
4x²-2x-2x+1-81x²-63x-63x+49
-77x²-130x+50
3 votes
Thanks 1
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2.(2x+1)(2x+1)+(5x-7)(5x-7)
4x²+2x+2x+1+25x²+35x-35x+49
29x²+4x+49
3.(2x-1)(2x-1)-(9x-7)(9x-7)
4x²-2x-2x+1-81x²-63x-63x+49
-77x²-130x+50