Réponses

2014-09-14T11:18:18+02:00
14x + 2 = 2 × 7x + 2 × 1 = 2(7x + 1)

400 + 20a = 20 × 20 + 20 × a = 20(20 + a)

-10 + 2y = 2 × (-5y) + 2 × 1 = 2(-5y + 1)