Tính: `a)√(3) + √(2) – 2√(6) . ( √(6) -1 )

$\sqrt[]{3}+\sqrt[]{2}-2\sqrt[]{6}(\sqrt[]{6}-1)$

$=\sqrt[]{3}+\sqrt[]{2}-2\sqrt[]{6}.\sqrt[]{6}+2\sqrt[]{6}$

$=\sqrt[]{3}+\sqrt[]{2}-12+2\sqrt[]{6}$