3/2*5+3/5*8+3/8*11+...+3/2009*2012明天要交的....
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![3/2*5+3/5*8+3/8*11+...+3/2009*2012明天要交的....](/uploads/image/z/214312-40-2.jpg?t=3%2F2%2A5%2B3%2F5%2A8%2B3%2F8%2A11%2B...%2B3%2F2009%2A2012%E6%98%8E%E5%A4%A9%E8%A6%81%E4%BA%A4%E7%9A%84....)
3/2*5+3/5*8+3/8*11+...+3/2009*2012明天要交的....
3/2*5+3/5*8+3/8*11+...+3/2009*2012
明天要交的....
3/2*5+3/5*8+3/8*11+...+3/2009*2012明天要交的....
3/2*5+3/5*8+3/8*11+...+3/2009*2012
=1/2-1/5+1/5-1/8+……+1/2009-1/2012
=1/2-1/2012
=1005/2012