2011-09-29
展开全部
|1/3-1/2|+|1/4-1/3|+...+|1/2005-1/2004|
=1/2-1/3+1/3-1/4+...+1/2004-1/2005
=1/2-1/2005
=2003/4010
=1/2-1/3+1/3-1/4+...+1/2004-1/2005
=1/2-1/2005
=2003/4010
追问
能解说一下?不?
追答
=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+...+(1/2003-1/2004)+(1/2004-1/2005)
=1/2+(-1/3+1/3)+(-1/4+1/4)+(-1/5-1/6)+(-1/7+1/7)+...+(-1/2003+1/2003)+(-1/2004+1/2004)-1/2005
=1/2+0+0+0+0+...+0+0-1/2005
=1/2-1/2005
=2003/4010
行了不?
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