小学六年级数学2/(1/3)+2/(2/3)+2/(3*4)-查字典问答网
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来自刘珑龙的问题

  小学六年级数学2/(1/3)+2/(2/3)+2/(3*4)+······+2/(2008*2009)=?抱歉,有些错误。2/(1*2)+2/(2*3)+2/(3*4)+······+2/(2008*2009)=?

  小学六年级数学2/(1/3)+2/(2/3)+2/(3*4)+······+2/(2008*2009)=?

  抱歉,有些错误。2/(1*2)+2/(2*3)+2/(3*4)+······+2/(2008*2009)=?

1回答
2019-11-21 11:27
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何健刚

  2/(1*2)+2/(2*3)+2/(3*4)+······+2/(2008*2009)

  =2*(1-1/2+1/2-1/3+1/3-1/4.1/2008-1/2009)

  =2*(1-1/2009)

  =2*2008/2009

  =4016/2009

2019-11-21 11:30:23

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