|1/2009-1/2008|+|1/2008-1/2007|+|1/2007-1/2006|-|1/2006-1/2009|

1/2009+2/2009+3/2009+.+2008/2009=? 2010*2009-2009*2008+2008*2007-2007*2006.+2*1 1+2+3+...+2008+2009+2008+...+3+2+1= 【9又2008/2009-(8-1/2009)】/2 *1/2 1/1*2+1/2*3+...+1/2008*2009= 2009*（1-1/2009)*(1-1/2008)*(1-1/2007)*.*(1-1/2) 2008×2009-1分之2008+2009×2007 2008+2009×2007/2008×2009-1 2008+2007+2009/2008*2009-1 2008+2009*2007/2008*2009-1 2008*2009-1与2008^-2008*2009+2009^的大小2008*2009-1与2008^-2008*2009+2009^ 2010!+2009!+2008!+.+2!+1!= 2009×2009+2008分之2009×2010-1 1/2009+2/2009+3/2009+.+2008/2009=?1/2+1/4+1/8+1/16+.+1/1024=? (1/2+1/3.+1/2009)*(1+1/2+1/3..+1/2008)-(1+1/2+1/3..+1/2009)*(1/2+1/3..+1/2008) (1/2010-1)*(1/2009-1)*(1/2008-1)*...*(1/3-1)*(1/2-1)尽快. 计算(1/2008-1/2009)+(1/2007-1/2008)+.+(1-1/2) 初中绝对值|1/2010-1/2009|+|1/2009-1/2008|+...|1/2-1|