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Bloom59135
@Bloom59135
April 2019
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Pouvez vous m'aider svp ❤
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Rachidael251
L'ex 4 je sais pas dsl
l'ex 5:
1) 4ac-6ab= 2a (2c-3b)
2)(x-2)(5x-1)+(2x+7)(x-2) =(x-2)[(5x-1)+(2x+7)]
= (x-2)(5x-1+2x+7)
=(x-2)(7x+6)
3)x au carré-6x+9
= (x-3)le tout au carré
4)36(x au carré)-81
= 9 (4 (x au carré)-9)
= 9 (2x-3)(2x+3)
exercice 6
A= (2x+1)(3x+2)+(4x+7)(2x+1)
= (2x+1)[(3x+2)+(4x+7)]
= (2x+1)(3x+2+4x+7)
=(2x+1)(7x+9)
B= (5x-7)(6-x)+(6-x)
= (6-x)[(5x-7)+1]
= (6-x)(5x-7+1)
=(5-x)(5x-6)
la fonction s'annule en x= 4/3 et x= -7/5
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Lista de comentários
l'ex 5:
1) 4ac-6ab= 2a (2c-3b)
2)(x-2)(5x-1)+(2x+7)(x-2) =(x-2)[(5x-1)+(2x+7)]
= (x-2)(5x-1+2x+7)
=(x-2)(7x+6)
3)x au carré-6x+9
= (x-3)le tout au carré
4)36(x au carré)-81
= 9 (4 (x au carré)-9)
= 9 (2x-3)(2x+3)
exercice 6
A= (2x+1)(3x+2)+(4x+7)(2x+1)
= (2x+1)[(3x+2)+(4x+7)]
= (2x+1)(3x+2+4x+7)
=(2x+1)(7x+9)
B= (5x-7)(6-x)+(6-x)
= (6-x)[(5x-7)+1]
= (6-x)(5x-7+1)
=(5-x)(5x-6)
la fonction s'annule en x= 4/3 et x= -7/5