已知是单位向量，且满足。则_________。/ananas/latex/p/237722/ananas/latex/p/450472/ananas/latex/p/1010594
已知是单位向量，且满足。则_________。/ananas/latex/p/237722/ananas/latex/p/450472/ananas/latex/p/1010594
1
已知是单位向量，且满足。则_________。/ananas/latex/p/237722/ananas/latex/p/450472/ananas/latex/p/1010594