So sánh : 7^2010 +1/ 7^2011 -1 và 7^2011+1 / 7^2012 – 1
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Vì $\frac{7^{2010}+1}{7^{2011}-1}$ < 1=>$\frac{7^{2010}+1}{7^{2011}-1}$<$\frac{7^{2010}+7+1}{7^{2011}+7-1}$=>$\frac{7^{2010}+1}{7^{2011}-1}$ <$\frac{7^{2010}+7^{1}+1}{7^{2011}+7^{1}-1}$=>$\frac{7^{2010}+1}{7^{2011}-1}$<$\frac{7^{2011}+1}{7^{2012}-1}$
Vì $\frac{7^{2010}+1}{7^{2011}-1}$ < 1=>$\frac{7^{2010}+1}{7^{2011}-1}$<$\frac{7^{2010}+7+1}{7^{2011}+7-1}$=>$\frac{7^{2010}+1}{7^{2011}-1}$ <$\frac{7^{2010}+7^{1}+1}{7^{2011}+7^{1}-1}$=>$\frac{7^{2010}+1}{7^{2011}-1}$<$\frac{7^{2011}+1}{7^{2012}-1}$
TLHN nha