送交者: blackbox 于 2009-01-30, 16:43:08:

回答: math quiz: 1/2 + 1/(2*3) + 1/(3*4) + 1/(4*5) ... 1/(1995*1996) = ? 由 steven 于 2009-01-30, 16:36:33:

• test (无内容) - laoliu (0 bytes) 2009-02-01, 06:16:49 (296658)

加跟贴