1/1*2+1/3*4+1/4*5+.+1/2008*2009

1/1*2+1/3*4+1/4*5+.+1/2008*2009 1.|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+...+|1/2009-1/2008|= 1/(2*3)+1/(3*4)+1/(4*5)+.+1/(2008*2009)如何简算 1-1/1*2-1/2*3-1/3*4-1/4*5……-1/2008*2009的值 计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2009-1/2008| 1+(1/2-1)+(1/3-1/2)+(1/4-1/3)+(1/5-1/4)+…+(1/2009-1/2008)+(1 （-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2008*1/2009)+(-1/2009*1 ｜1/2-1｜+｜1/3-1/2｜+1/4-1/3｜+...｜1/2009-1/2008｜+｜1/2010-1/2009 "1*2/1+2*3/1+3*4/1+.+2007*2008/1+2008*2009/1+2009*2010/1"这道题 (1+3+5+...+2009)-(2+4+6+...+2008)=? 1-2+3-4+5-6.-2008+2009等于 1-2+3-4+5-6...+2008-2009等于几?