Réponses

2013-12-08T12:23:39+01:00
A=5x+2x+10x
=x(5+2+10)
=x(17)
=17x

B=27x²-27x+27
=27(x²-x+1)

C=9x(x-3)+9x(10+2x)
=9x(x-3+10+2x)
=9x(3x+7)

D=(2x+1)(8+x)-(3x-1)(2x+1)
=(2x+1)(8+x-3x+1)
=(2x+1)(9-2x)