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bonjour cius pouvez maider svp je comprens rien 9 Factorise puis réduis.
D = (2x - 1)(r - 5) + (x + 1)(r - 5)
E = (2y + 5)2+ (2y + 5)(-3y + 1)
F = (3.r + 7)(2r - 9) - (3.7 + 7)2
Exercices 4ème​

Sagot :

Bonjour,

D = (2x - 1)(r - 5) + (x + 1)(r - 5)

(r-5) ( 2x-1 + x+1)=

(r-5) ( 3x)

E = (2y + 5)²+ (2y + 5)(-3y + 1)

(2y+5) ( 2y+5  -3y +1)=

(2y+5)( -y +6)

F = (3.r + 7)(2r - 9) - (3.r + 7)²

(3r +7) ( 2r-9 -3r -7)=

(3r+7) ( -r -16)

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