三维向量的叉乘公式 a × b= [a2b3-a3b2,a3b1-a1b3, a1b2-a2b1] 的减号从何而来例如a=(i,j,k) b=(i,2j,3k) 利用公式可以求出正确结果 可是我想问的是 a*b利用分配率得出 i*i+i*2j+i*3k + j*i+j*2j+j*3k + k*i+k*2j*k*3
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![三维向量的叉乘公式 a × b= [a2b3-a3b2,a3b1-a1b3, a1b2-a2b1] 的减号从何而来例如a=(i,j,k) b=(i,2j,3k) 利用公式可以求出正确结果 可是我想问的是 a*b利用分配率得出 i*i+i*2j+i*3k + j*i+j*2j+j*3k + k*i+k*2j*k*3](/uploads/image/z/7119341-53-1.jpg?t=%E4%B8%89%E7%BB%B4%E5%90%91%E9%87%8F%E7%9A%84%E5%8F%89%E4%B9%98%E5%85%AC%E5%BC%8F+a+%C3%97+b%3D+%5Ba2b3-a3b2%2Ca3b1-a1b3%2C+a1b2-a2b1%5D+%E7%9A%84%E5%87%8F%E5%8F%B7%E4%BB%8E%E4%BD%95%E8%80%8C%E6%9D%A5%E4%BE%8B%E5%A6%82a%3D%28i%2Cj%2Ck%29+b%3D%28i%2C2j%2C3k%29+%E5%88%A9%E7%94%A8%E5%85%AC%E5%BC%8F%E5%8F%AF%E4%BB%A5%E6%B1%82%E5%87%BA%E6%AD%A3%E7%A1%AE%E7%BB%93%E6%9E%9C+%E5%8F%AF%E6%98%AF%E6%88%91%E6%83%B3%E9%97%AE%E7%9A%84%E6%98%AF+a%2Ab%E5%88%A9%E7%94%A8%E5%88%86%E9%85%8D%E7%8E%87%E5%BE%97%E5%87%BA+i%2Ai%2Bi%2A2j%2Bi%2A3k++%2B++j%2Ai%2Bj%2A2j%2Bj%2A3k++%2B++k%2Ai%2Bk%2A2j%2Ak%2A3)
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