Réponses

2014-01-09T20:21:53+01:00
Bonsoir

a premiere:
K=-2x(-4x-6)-9(-2-8x)
K = 8x² +12x +18 +72x
K = 8x² + 84x +18

la deuxsieme:
L=6-x[4-3(8-9x)]
L = 6 -4x -24 + 27x
L = 23x - 18