1/1*2+1/3*4+1/5*6+...+1/2007*2008-1/1005-1/1006-1/1007-...-1
(1-1/2+1/3-1/4...+1/2007-1/2008)÷(1/1005+1/1006+1/1007+...+1
简便计算,(1-1/2+1/3-1/4+1/5-…+1/2007-1/2008)/(1/1005+1/1006+1/10
计算:1+2+3+4+5+…+2009+2010/(1-1/1006)(1-1/1007)…(1-1/2009)(1-1
求解个填空题-1*2008+2*2007-3*2006+4*2005……-1003*1006+1004*1005的个位数
1+(-2)+3+(-4)+5+(-6)+.+2007+(-2008)+2009的和是-1004还是1005?
计算题1-1/2-1/3+1/4+1/5-1/6-1/7+1/8+1/9……-1/2006-1/2007+1/2008+
1+2+3+4+5+6+7+8+9+10.+1000+1001+1002+1003+1004+1005+1006+100
1007-1
2012+2011+2010+…+1007-1006-1005-1004-…-1=______.
代数和-1×2008+2×2007-3×2006+4×2005+…-1003×1006+1004×1005的个位数字是多
1/2009-1/2008|+|1/2008-1/2007|+|1/2007-1/2006|+.+|1/3-1/2|+|
|2009/1-2008/1|+|2008/1-2007/1|+|2007/1-2006/1|+.+|3/1-2/1|+