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向量的叉乘如X叉乘Y就是一個垂直與X和Y組成的平面的一個向量,方向是這樣决定的,右手四指與X的方向相同,大拇指與四指垂直,然後四指按照這樣的方向繞,從X開始,經過X與Y的銳角的方向環繞,拇指所指的方向就是X叉乘Y的方向
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