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Okipk
@Okipk
May 2019
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Bonsoir je suis en 3 eme, je n’arrive pas à faire ses deux exercices, si vous pourriez m’aidez, merci d’avance
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Bonsoir
le premier tu factorise
0 votes
Thanks 1
cossin23
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1)2/3y^2+7y=
y(2/3y+7)=
y(2y/3+7)
2)(7-x)(8-x)-(4+x)(7-x)=
56-7x-8x+x^2-(28-4x+7x-x^2)=
56-15x+x^2-28-3x+x^2=
2x^2-18x+28
où
(7-x)(8-x-4-x)=
(7-x)(4-2x)=
2(7-x)(2-x)
0 votes
Thanks 1
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Lista de comentários
Verified answer
Bonsoirle premier tu factorise
Verified answer
1)2/3y^2+7y=y(2/3y+7)=
y(2y/3+7)
2)(7-x)(8-x)-(4+x)(7-x)=
56-7x-8x+x^2-(28-4x+7x-x^2)=
56-15x+x^2-28-3x+x^2=
2x^2-18x+28
où
(7-x)(8-x-4-x)=
(7-x)(4-2x)=
2(7-x)(2-x)