三矢量乘 44,A A(B×C)=BB,B CCC B A.(B×C)=B(C×A)=C.(A×B) (B×C)=B(A·C)-C(A·B) A×(B×C)+B×(C×A)+C×(A×B)=0➢ 三矢量乘 ( ) x y z x y z x y z A A A A B C B B B C C C   = A B C B C A C A B   =   =   ( ) ( ) ( ) A B C A B C B A C C A B   =  −  ( ) ( ) ( ) A B C B C A C A B   +   +   = ( ) ( ) ( ) 0