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nguyenbahiep1

[laTEX]A = (\sqrt{4+\sqrt{7}}+\sqrt{4-\sqrt{7}})^3 \\ \\ A = ( \sqrt{\frac{(\sqrt{7}+1)^2}{2}}+\sqrt{\frac{(\sqrt{7}-1)^2}{2}})^3 \\ \\ A = \sqrt{14^3} = 14\sqrt{14}[/laTEX]
 
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