(1+1/2007+1/2008)*(1/2007+1/2008+1/2009)-(1+1/2007+1/2008+1/

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(1+1/2007+1/2008)*(1/2007+1/2008+1/2009)-(1+1/2007+1/2008+1/2009)*(1/2007+1/2008)详解

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2026-06-05 18:58:12

先提取公因子:(1/2007+1/2008+1/2009)即:(1/2007+1/2008+1/2009) * (1+1/2007+1/2008- 1/2007-1/2008)=(1/2007+1/2008+1/2009) * 1=1/2007+1/2008+1/2009

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    2026-06-05 18:58:12

    先提取公因子:(1/2007+1/2008+1/2009)即:(1/2007+1/2008+1/2009) * (1+1/2007+1/2008- 1/2007-1/2008)=(1/2007+1/2008+1/2009) * 1=1/2007+1/2008+1/2009

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