bjr
A = (x-2)² - (x-1) (x-4)
tableau
quand x = 10 :
x - 2 = 10 - 2 = 8
(x-2)² = (10-2)² = 8² = 64
x - 1 = 10 - 1 = 9
x - 4 = 10 - 4 = 6
(x-1) (x-4) = 9 * 6 = 54
A = 64 - 54 = 10
même raisonnement quand x = 100 pour la seconde ligne
A = (x-2)² - (x-1) (x-4)
A = x² - 4x + 4 - (x² - 4x - x + 4)
A = x² - 4x + 4 - x² + 5x - 4
A = x
1234² - 1235 x 1232 = (1234 - 2)² - (1236 - 1) (1236 -4) = 1236
