(3倍的根号2-根号6)(负3倍的根号2-根号6)等于

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(3倍的根号2-根号6)(负3倍的根号2-根号6)等于

(3倍的根号2-根号6)(负3倍的根号2-根号6)等于
(3倍的根号2-根号6)(负3倍的根号2-根号6)等于

(3倍的根号2-根号6)(负3倍的根号2-根号6)等于
3√2-√6﹚﹙﹣3√2-√6﹚
=﹙﹣√6﹚²-﹙3√2﹚²
=6-18
=﹣12.

(3√2-√6)(-3√2-√6)
=(√6+3√2)(√6-3√2)
=6-18
=-12

-12