Réponses

2014-01-25T17:29:20+01:00
( x + 5 )² - ( x-5)²
x² + 10x + 25 - (x² - 10x + 25 )
x² + 10x + 25 - x² + 10x - 25 
20x

10 005² - 9 995²

(10000 + 5) ( 10000 -5)
10000² -25
100000000 - 25
99999975