Răspuns:
Explicație pas cu pas:
a + b = 1/2+2/3+3/4+4/5+5/6+6/7+1/2+1/3+1/4+1/5+1/6+1/7
= (1/2 + 1/2) + (2/3 + 1/3) + (3/4 + 1/4) + (4/5 + 1/5) + (5/6 + 1/6) + (6/7 + 1/7)
= 2/2 + 3/3 + 4/4 + 5/5 + 6/6 + 7/7
= 1 + 1 + 1 + 1 + 1 + 1 = 6
a + 2004 + b = 6 + 2004 = 2010 = numar natural (adica intreg si pozitiv)
