1/2008-1/2007的绝对值+1/2009-1/2008的绝对值-1/2007-1/2009的绝对值(急)
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1/2008-1/2007的绝对值+1/2009-1/2008的绝对值-1/2007-1/2009的绝对值(急)
大哥大姐帮帮忙啦
1/2008-1/2007的绝对值+1/2009-1/2008的绝对值-1/2007-1/2009的绝对值
大哥大姐帮帮忙啦
1/2008-1/2007的绝对值+1/2009-1/2008的绝对值-1/2007-1/2009的绝对值
1/2008-1/2007的绝对值+1/2009-1/2008的绝对值-1/2007-1/2009的绝对值
=1/2007-1/2008+1/2008-1/2009-(1/2007-1/2009)
=1/2007-1/2008+1/2008-1/2009-1/2007+1/2009
=0
=1/2007-1/2008+1/2008-1/2009-(1/2007-1/2009)
=1/2007-1/2008+1/2008-1/2009-1/2007+1/2009
=0
1/2008-1/2007的绝对值+1/2009-1/2008的绝对值-1/2007-1/2009的绝对值(急)
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