Bonjour je doit développer tous sa mais je suis bloqué aidez moi svp a) (2x-5)(3x+6) b)(5y-2)² c)(3t+6) (3t-6) d) (2y-5) (4y+2) -2y (6-y) e) (3t+racine carré5)²-2 (t+ racine carré de 5) merci
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droopette
A) (2x-5)(3x+6) =6x²+12x-15x-30 =6x²-3x-30
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=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