Toán violympic, giúp mình với, vòng 3 ♥

N

nguyenbahiep1

[laTEX]A = \sqrt{11-2\sqrt{18}} = \sqrt{11-6\sqrt{2}} = \sqrt{(3-\sqrt{2})^2} \\ \\ A = 3 - \sqrt{2} \Rightarrow a = 3 , b = - 1 \Rightarrow ab = - 3 [/laTEX]
 
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