已知1/2+1/6+1/12+1/20+...+1/2011*2010

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已知1/2+1/6+1/12+1/20+...+1/2011*2010
已知1/2+1/6+1/12+1/20+...+1/2011*2010

已知1/2+1/6+1/12+1/20+...+1/2011*2010
1/2+1/6+1/12+1/20+...+1/2010*2011
=1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/2010-1/2011
=1-1/2011
=2010/2011

原式=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+...+1/2010-1/2011=1-1/2011=2010/2011