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phuongxuan
2 năm trước
So sánh A và B nếu : A = $\frac{2006}{2007}$ - $\frac{2007}{2008} + $\frac{2008}{2009} - $\frac{2009}{2010} B = - $\frac{1}{2006 ×2007} - $\frac{1}{2007 ×2008}
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