Réponses

2014-10-03T18:23:39+02:00
Si on prend x=99998, alors 99997²-99999²+99998=(x-1)²-(x+1)²+x=((x-1)-(x+1))((x-1)+(x+1))=2x-2.

Donc 99997²-99999²+99998=2×99998-2=199994