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Oce2311
@Oce2311
April 2019
2
20
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E=(5x-2)²-(x-7)(5x-2)
developper puis reduire
factoriser
calculer la valeur numerique pour x=-1
merci d'avance
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amykim12
1) E=(5x-2)²-(x-7)(5x-2)
= 25x² - 20x + 4 - 5x² + 2x + 35x - 14
E = 20x² + 15x - 10
2) E=(5x-2)²-(x-7)(5x-2)
= (5x-2)(5x-2-x+7)
E=(5x-2)(4x+5)
3) E=(5x-2)²-(x-7)(5x-2)
= 20x² + 15x - 10
= 20 - 15 - 10
E = - 5
1 votes
Thanks 1
amykim12
Derien ^^
pauline64
1) Développer puis réduire:
e=(5x-2)²-(x-7)(5x-2)
e=(25x²-4)-(5x²-2x-35x+4)
e=20x²-37x
0 votes
Thanks 0
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Lista de comentários
= 25x² - 20x + 4 - 5x² + 2x + 35x - 14
E = 20x² + 15x - 10
2) E=(5x-2)²-(x-7)(5x-2)
= (5x-2)(5x-2-x+7)
E=(5x-2)(4x+5)
3) E=(5x-2)²-(x-7)(5x-2)
= 20x² + 15x - 10
= 20 - 15 - 10
E = - 5
e=(5x-2)²-(x-7)(5x-2)
e=(25x²-4)-(5x²-2x-35x+4)
e=20x²-37x