1/2009+2/2009+3/2009+.2007/2009+2008/2009等于多少
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1/2009+2/2009+3/2009+.2007/2009+2008/2009等于多少
1/2009+2/2009+3/2009+.2007/2009+2008/2009等于多少
1/2009+2/2009+3/2009+.2007/2009+2008/2009等于多少
1/2009+2/2009+3/2009+.2007/2009+2008/2009
=1/2009(1+2+3+.2007+2008)
=1/2009×[(1+2008)×1004]
=1/2009×2009×1004
=1004