Réponses

2014-02-06T19:13:55+01:00
A= 5x * 2x + 5x * 7 - 3 * 2x - 3 * 7
  = 10x² + 35x - 6 x - 21
  = 10x² +29x -21

B= 6y * 3y - 6y*10 + 7*3y -7*10
  = 18y² - 60y +21y - 70
  =18y² - 49y - 70