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向量a,是一個向量,有方向,有大小向量|a|,這一寫法是錯的,應是|向量a|,這表示向量的大小|ab|是向量a與向量b求得的數量積的絕對值,例a=(1,2),b=(2,-1),那麼ab=1*2+2*(-1)[*表示乘號]=0,所以|ab|=|0|=0|a||b|,…
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