Réponses

2013-10-24T19:22:35+02:00
Exercice 73 : 
A = (1X1 + 1X-4x + -4xX1 + -4xX-4x ) + (5xX1 + 5xX-4x + 7X1 + 7X-4x)
A = (1 + -4x + -4x + -16x
²) + (5x + -20x² + 7 + -28x)
A = (-16x
²  - 8x + 1 ) + (-20x² - 23x + 7)
A = - 36x
² - 31x +8