来自宋政湘的问题
【一道初中计算题,(用简便方法计算)急~(1/2+1/3+1/4+……+1/2007)*(1+1/2+1/3+1/4+……+1/2006)-(1+1/2+1/3+1/4+……+1/2007)*(1/2+1/3+1/4+……+1/2006)=】
一道初中计算题,(用简便方法计算)急~
(1/2+1/3+1/4+……+1/2007)*(1+1/2+1/3+1/4+……+1/2006)-(1+1/2+1/3+1/4+……+1/2007)*(1/2+1/3+1/4+……+1/2006)=
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2020-01-1701:11