[toán 9]- so sánh căn thức bậc hai

S

sayhi

Dùng nhân liên hợp :D

$\sqrt{2013}-\sqrt{2012}=\dfrac{1}{\sqrt{2013} +\sqrt{2012}}=A$

$\sqrt{2012}-\sqrt{2011}=\dfrac{1}{\sqrt{2012} +\sqrt{2011}}=B$

Dễ thấy : $\sqrt{2013} +\sqrt{2012} >\sqrt{2012} +\sqrt{2011}$
=> A<B
 
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