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nguyenbahiep1

[laTEX](\frac{2+\sqrt{3}}{4})^x + (\frac{2-\sqrt{3}}{4})^x = 1 \\ \\ TH_1: x > 1 \Rightarrow VT < 1 \\ \\ TH_2: x < 1 \Rightarrow VT > 1 \\ \\ \Rightarrow x = 1[/laTEX]
 
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