Réponses

2013-02-06T20:18:39+01:00
Meilleure réponse !
2013-02-06T20:39:08+01:00

b) (y+1)(y+5) = y² +6y +5

c) (2a-2)(1+3a) = 6a²-4a-2

d) (b-1)( 5-b) = -b²+6b-5

e) (-y+5)(y-5) = -y²+10y-25

f) (6y-9)(4y-8) = 24y²-84y+72