计算:(1/2+1/3+......+1/2011)×(1+1/2+...+1/2010)-(1+1/2+...+1/2011)×(1/2+1/3+...+1/2010)
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:(1/2+1/3+......+1/2011)×(1+1/2+...+1/2010)-(1+1/2+...+1/2011)×(1/2+1/3+...+1/2010)
=(1/2+1/3+....1/2011)+(1/2+1/3+...1/2011)×(1/2+1/3+...1/2010)-(1/2+1/3+....1/2011)×(1/2+1/3+....1/2010)-(1/2+1/3+....1/2010)
=1/2+1/3+....1/2011-(1/2+1/3+....1/2010)
=1/2011
=(1/2+1/3+....1/2011)+(1/2+1/3+...1/2011)×(1/2+1/3+...1/2010)-(1/2+1/3+....1/2011)×(1/2+1/3+....1/2010)-(1/2+1/3+....1/2010)
=1/2+1/3+....1/2011-(1/2+1/3+....1/2010)
=1/2011
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