Réponses

2014-01-05T13:00:25+01:00
A = 5x+ 3x
=x(5+3)
=x*8
=8x

B=3x - 8x
=x(3-8)
=x(-5)
=-5x

C= - 4x + 15x
=x(-4+15)
=x*11
=11x

D= - 9x - 6x 
=3x(-3-2)
=3x(-5)
=-15x

* est le signe de la multiplication