Réponses

  • Utilisateur Brainly
2013-10-02T19:51:23+02:00
7+4x-(-2+3x)
=7x²+4x+2x²-3x
=9x²+x

 -6x(2x-3)
=-12x²+18x

2(x+3)-3(5-3x)

=2x+6-15+9x
=11x-9