(1+2/1+3/1+4/1)×(2/1+3/1+4/1+5/1)-(1+2/1+3/1+4/1+5/1)×(2/1+3
(1+1/2+1/3+1/4+1/5)*(1/3+1/4+1)-(1+1/3+1/4)*(1/2+1/3+1/4+1/5
简算:(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/
/1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/
提问题(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)×(1+1/2+1/
-1/2,+1/3,-1/4,+1/5,-1/6,.
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*(1+1/4)*(1-1/4)*(1+1/5)*(1-1
(1-1/2)(1/3-1)(1-1/4)(1/5-1)``````(1/2009)(11/2010)
2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+(-1/4*1/5)+""+(-1/2005*1/2006
一道奥数题,急救!(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/
| 1/3 - 1/2 | + | 1/4 - 1/3 | + | 1/5 - 1/4 | …… + | 1/2009
计算(1-1/2)(1/3-1)(1-1/4)(1/5-1)...(1/2013-1)(1-1/2014)