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[ equation]$\frac{2}{3}$[ equation]
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$\frac{2}{3}$
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[equation]$\frac{x+1}{2}$+{x+2}{3}{x+3}{4}+$\ldots$+{x+2011}{2012}=2011[equation]
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[equation]$\frac{x+1}{2}$+{x+2}{3}{x+3}{4}$+$\ldots$+{x+2011}{2012}=2011[equation]
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