Réponse :
Coucou :)
A = -5x(2x-5)+x
=-5x*2x-5x(-5)+x
=-5x*2x+5x*5+x
=-10x²+25x+x
=10x²+26x
B= -6(-3x-7)+4x
=-6(-3x)-6*(-7)+4x
=6*3x+6*7+4x
=18x+6*7+4x
=18x+42+4x
=22x+42
C=(-x-2)6x-(4x-6)
=-6x*x-6x*2-(4x-6)
=-6x*x-6x*2-4x+6
=-6x²-12x-4x+6
=-6x²-16x+6
D= -2x-(4x-3)
=-2x-4x+3
=-6x+3
E=-10x(-3x-9)+(6x-5)
=-10x(-3x)-10x*(-9)+x*6x-x*5
=10x*3x+10x*9+x*6x-x*5
=30x²+90x+6x²-5x
=36x²+85x
F= -4x(-3x-1)
=4x(3x+1)
=4x-3x+4x
=12x²+4x
A bientôt =)
