1/1×2+1/2×3+1/4×5+……+1/2009×2010
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1/1×2+1/2×3+1/4×5+……+1/2009×20101/1×2+1/2×3+1/4×5+……+1/2009×20101/1×2+1/2×3+1/4×5+……+1/2009×2010&nbs
1/1×2+1/2×3+1/4×5+……+1/2009×2010
1/1×2+1/2×3+1/4×5+……+1/2009×2010
1/1×2+1/2×3+1/4×5+……+1/2009×2010