Ta co \(\sqrt{2012}-\sqrt{2011}=\frac{\left(\sqrt{2012}-\sqrt{2011}\right)\left(\sqrt{2012}+\sqrt{2011}\right)}{\sqrt{2012}+\sqrt{2011}}=\frac{1}{\sqrt{2012}+\sqrt{2011}}\)
\(\sqrt{2013}-\sqrt{2012}=\frac{\left(\sqrt{2013}-\sqrt{2012}\right)\left(\sqrt{2013}+\sqrt{2012}\right)}{\sqrt{2013}+\sqrt{2012}}=\frac{1}{\sqrt{2013}+\sqrt{2012}}\)
Do \(\sqrt{2012}+\sqrt{2011}< \sqrt{2013}+\sqrt{2012}\)
Suy ra \(\frac{1}{\sqrt{2012}+\sqrt{2011}}>\frac{1}{\sqrt{2013}+\sqrt{2012}}\)hay \(\sqrt{2012}-\sqrt{2011}>\sqrt{2013}-\sqrt{2012}\)
\(\sqrt{2012}-\sqrt{2011}>\sqrt{2013}-\sqrt{2012}\)
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2012-2011 lớn hơn
