Réponses

2013-11-01T12:05:36+01:00
A) (2x-5)(3x+6)
=6x²+12x-15x-30
=6x²-3x-30

b)(5y-2)²
=25y²-40y+4

c)(3t+6) (3t-6)
=9t²-36

d) (2y-5) (4y+2) -2y (6-y)
=8y²+4y-20y-10-(12y+2y²)
=8y²-16y-10-12y-2y²
=6y²-28y-10

e) (3t+V5)²-2 (t+ V5)
=9t²+6tV5+5-2t-2V5