Réponses

  • Utilisateur Brainly
2014-10-02T19:13:00+02:00
(x - 1)(x + 1)
= x² - 1²
= x² - 1

99 x 101
= (100 - 1)(100 + 1)
= 100² - 1²
= 10 000 - 1
= 9 999