Réponses

2014-10-13T12:33:38+02:00
Bonjour

A = ( x - 3)² - ( x -1)( x -2)
A = x² - 6 x + 9 - ( x² - 2 x - x + 2)
A = x² - 6 x +9 - x² + 2 x + x - 2
A = - 3 x + 7

99 997² - (99 999 x 99 998) 
= ( 100 000 - 3)² - ( 100 000 - 1)( 100 000 -2)