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Fradeg
@Fradeg
April 2019
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Salut je bloque sur une question de maths svp vous pouvez m'aider?
Il faut prouver que (2y-5)²-(4y-10)(y+3) peut s'écrire -11(2y-5)
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Bonjour
Fradeg
Il suffit de mettre (2y-5) en facteur.
2 votes
Thanks 1
Commentaires
Bonjour ,
(2y-5)² - (4y-10) (y+3)
⇒
(2y-5)²
- 2
(2y-5)
(y+3)
= (2y-5) [ (2y-5) - 2(y+3) ]
= (2y-5) [ 2y - 5 - 2y - 6 ]
= (2y-5) (-11)
=
-11(2y-5)
2 votes
Thanks 1
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Il suffit de mettre (2y-5) en facteur.
(2y-5)² - (4y-10) (y+3)
⇒ (2y-5)² - 2(2y-5) (y+3)
= (2y-5) [ (2y-5) - 2(y+3) ]
= (2y-5) [ 2y - 5 - 2y - 6 ]
= (2y-5) (-11)
= -11(2y-5)