设a=2i-3j+k,b=i-j+3k,c=i-2j,求: (1)(a×b)×c; (2)(a×b)×c; (3)a×(b×c); (4)(a×b)c(a×c)b.

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问题 设a=2i-3j+k,b=i-j+3k,c=i-2j,求:
(1)(a×b)×c;    (2)(a×b)×c;    (3)a×(b×c);    (4)(a×b)c(a×c)b.

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