赞 共回答了19个问题采纳率：94.7% 举报
1/2×4+1/4×6+1/6×8+……+1/2008×2010
=1/2×(1/2-1/4+1/4-1/6+1/6-1/8+……+1/2008-1/2010)
=1/2×(1/2-1/2010)
=251/1005
=1/2×(1/2-1/4+1/4-1/6+1/6-1/8+……+1/2008-1/2010)
=1/2×(1/2-1/2010)
=251/1005
1年前
10
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