overrightarrow(a)=(1,0,1),overrightarrow(b)=(2,1,1),则overrightarrow(a)×overright
化简:(1)overrightarrow(BC)+overrightarrow(AB);(2)overrightarrow(DB)+overrightarrow
设overrightarrow(a)=(1,1,4),overrightarrow(b)=(1,-2,2),则overrightarrow(a)+overrig
设overrightarrow(a)=(1,-1,2),overrightarrow(b)=(3,-2,-1),则overrightarrow(a)×overr
已知overrightarrow(a)=(2,1,-1), overrightarrow(b)=(1,-1,2), 则overrightarrow(a)time
向量overrightarrow(a)、overrightarrow(b)、overrightarrow(c)两两垂直,且|overrightarrow(a)|
设overrightarrow(a)=(-1,1,2),overrightarrow(b)=(2,-2,-4),则向量|overrightarrow(a)×ov
已知三点A(1,-1,2)、B(3,3,1)和C(3,1,3),与overrightarrow(AB)、overrightarrow(BC)同时垂直的单位向量是
在平面直角坐标系xOy中.已知向量overrightarrow(a)、overrightarrow(b),|overrightarrow(a)|=|overri
若向量 overrightarrow(AB)=(-1,2), overrightarrow(BC)=(3,-2), 则 overrightarrow(AC) 等