(1-1/2+1/3-1/4.+1/2007-1/2008)÷(1/1005+1/1006+1/1007+.1/2008
(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
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|+
求解个填空题-1*2008+2*2007-3*2006+4*2005……-1003*1006+1004*1005的个位数
(1/2008-1)*(1/2007-1)*(1/2006-1)*...*(1/3-1)*(1/2-1)
(1-1/2^)(1-1/3^)……(1-1/2007^)(1-1/2008^)
计算(1/2+1/3+...+1/2008)*(1+1/2+...+1/2007)-(1+1/2+...+1/2008)
1-(1/2-1/3)-(1/3-1/4).-(1/2007-1/2008)=?
1007-1
计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2008-1/2007|+|1/2009-1
1/2008+2/2008+3+/2008+.+2007/2008 简算