设向量a=2i+3j,b=i+j-k,则a×b=()
设向量a=2i+3j,b=i+j-k,则a×b=()
A、-3i+5j+2k
B、-3i-5i+2k
C、-3i+2j-k
D、-1
【正确答案】:C
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