Răspunsuri

2014-10-23T19:35:17+03:00
(1-1/2)*(1-1/3)*(1-1/4)*.......(1-1/1998)=
se aduce la numitor comun
(2/2-1/2)*(3/3-1/3)*(4/4-1/4)*.......(1998/1998-1/1998)
faci reducerile si rez=1/1998