Răspunsuri

2014-09-30T20:16:00+03:00
2014-09-30T20:16:21+03:00
=1/2+1/(-2)²+1/(-2)³+1/(-2)la puterea 4=
1/2+1/4-1/8+1/16=
(8+4-2+1)/16=11/16