Réponses

2014-10-21T11:07:43+02:00
On pose x=123.456.789.513
On a donc (x+2)²+(x-1)²-(x²+(x+1)²)
(x+2)²+(x-1)²-(x²+(x+1)²)=x²+4x+4+x²-2x+1-(x²+x²+2x+1)=2x²+2x+5-2x²-2x-1=4