Question

aratati ca numarul x=2003+2ori (1+2+3+...+2002). este patrat perfect

Answer 1

x = 2003 + 2(1 + 2 + .. + 2002)

x = 2003 + 2·2002·2003 : 2

x = 2003 + 2002·2003

x = 2003(1 + 2002)

x = 2003·2003

x = 2003²