初中题l1/3-1/2I+I1/4-1/3I+I1/5-1/4I+.+I1/2005-1/2004I
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初中题l1/3-1/2I+I1/4-1/3I+I1/5-1/4I+.+I1/2005-1/2004I
![初中题l1/3-1/2I+I1/4-1/3I+I1/5-1/4I+.+I1/2005-1/2004I](/uploads/image/z/18652280-32-0.jpg?t=%E5%88%9D%E4%B8%AD%E9%A2%98l1%2F3-1%2F2I%2BI1%2F4-1%2F3I%2BI1%2F5-1%2F4I%2B.%2BI1%2F2005-1%2F2004I)
l1/3-1/2I+I1/4-1/3I+I1/5-1/4I+.+I1/2005-1/2004I
=1/2-1/3+1/3-1/4+1/4-1/5+……+1/2004-1/2005
=1/2-1/2005
=2003/4010
=1/2-1/3+1/3-1/4+1/4-1/5+……+1/2004-1/2005
=1/2-1/2005
=2003/4010