Răspunsuri

2014-10-19T11:52:58+03:00
1+2+3+4+....+2000= [2000(2000+1)] :2= (2000 * 2001) : 2
a= 2001 *2 * (2000*2001) :2( se simplifica 2 cu 2 )
sigur ai scris corect ecuatia ca ceva nu da?