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高中數學上我們知道,加法中遵循“平行四邊形法則”的量,只有向量;標量的加法運算是數位的直接相加,不能用其他法則,功是沒有方向的量(頂多只能說“沿某個方向的分力所做的功”,總的功是相加). 功不是向量,就沒有方向,所以就談不上有分量.
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