(2根号6-7根号2)(根号2+根号6)请用简便方法,

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(2根号6-7根号2)(根号2+根号6)请用简便方法,(2根号6-7根号2)(根号2+根号6)请用简便方法,(2根号6-7根号2)(根号2+根号6)请用简便方法,(2√6-7√2)(√2加√6)=2√

(2根号6-7根号2)(根号2+根号6)请用简便方法,
(2根号6-7根号2)(根号2+根号6)
请用简便方法,

(2根号6-7根号2)(根号2+根号6)请用简便方法,
(2√6-7√2)(√2加√6)
=2√12-7√2×√2加2√6×√6-7√12
=-5√12-14加12
=-10√3-2