Tính : a) $\sqrt{4+\sqrt{8} }$ . $\sqrt{2+\sqrt{2+\sqrt{2}}}$ . $\sqrt{2-\sqrt{2+\sqrt{2} } }$ b) ($\sqrt{10}$ + $\sqrt{6}$ )($\sqrt{15}$ - 4 ).$\sqrt{4+\sqrt{15}}$

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