送交者: 短江学者 于 2012-07-09, 12:54:13:

回答: 真够二的！N可是N+1，也可是N+N+1，，，N也可是0，适用于你这种情况，:-) 由 HHT 于 2012-07-09, 12:50:22:

• How can you be so sure that N is a number, and + is addition? (无内容) - steven (0 bytes) 2012-07-09, 16:41:03 (672903)

加跟贴