Ò»¡¢Ñ¡ÔñÌâ
1£®¸´Êý1£«i1£­i(iÊÇÐéÊýµ¥Î»)µÄÐ鲿Ϊ
A£®£­1¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B£®0
C£®1 D£®2
½âÎö¡¡1£«i1£­i£½1£«i1£«i1£­i1£«i£½1£«i22£½2i2£½i£¬¹ÊÐ鲿Ϊ1.
´ð°¸¡¡C
2£®(2011•ÈÕÕÕÄ£Äâ)iÊÇÐéÊýµ¥Î»£¬1£«2i2£­iµÈÓÚ
A£®i B£®5i
C.4£«5i5 D£®4£«5i