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就是向量的數量積,向量a•;a=|a|²;cos 0=|a|²;a•;b的幾何意義:數量積a•;b等於a的長度|a|與b在a的方向上的投影|b|cosθ的乘積.兩個向量的數量積等於它們對應座標的乘積的和.向量的數量積的性…
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