已知M1(1,-1,2)M2(3,3,1)M3(3,1,3)三点,求与M1M2,M2M3同时垂直的单位向量.答案里是用e=土...已知M1(1,-1,2)M2(3,3,1)M3(3,1,3)三点,求与M1M2,M2M3同时垂直的单位向量.答案里是用e=土(向量M1M2*向
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