计算(1/2+1/3+……+1/2005)(1+1/2+1/3……+1/2004)-(1+1/2……+1/2005)(1/2+1/3……+1/2004)

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计算(1/2+1/3+……+1/2005)(1+1/2+1/3……+1/2004)-(1+1/2……+1/2005)(1/2+1/3……+1/2004)
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计算(1/2+1/3+……+1/2005)(1+1/2+1/3……+1/2004)-(1+1/2……+1/2005)(1/2+1/3……+1/2004)
计算(1/2+1/3+……+1/2005)(1+1/2+1/3……+1/2004)-(1+1/2……+1/2005)(1/2+1/3……+1/2004)

计算(1/2+1/3+……+1/2005)(1+1/2+1/3……+1/2004)-(1+1/2……+1/2005)(1/2+1/3……+1/2004)
(1/2+1/3+……+1/2005)(1+1/2+1/3……+1/2004)-(1+1/2……+1/2005)(1/2+1/3……+1/2004)
=(1/2+1/3+……+1/2004)(1+1/2+1/3……+1/2004)+1/2005*(1+1/2+1/3……+1/2004)-(1+1/2……+1/2004)(1/2+1/3……+1/2004)-1/2005*(1/2+1/3……+1/2004)
=1/2005*(1+1/2+1/3……+1/2004)-1/2005*(1/2+1/3……+1/2004)
=1/2005[1+1/2+1/3……+1/2004-(1/2+1/3……+1/2004)]=1/2005