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2 năm trước
a)$\sqrt{6-2\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{18-\sqrt{128}}}}$ b)(4+$\sqrt{15}$).($\sqrt{10}$ -$\sqrt{6}$). $\sqrt{4-\sqrt{15}}$ c)$\sqrt{13-\sqrt{160}}$ - $\sqrt{53-4\sqrt{49}}$
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