3.已知向量overrightarrow(a)=(0,1),overrightarrow(b)=(2,x),若overrightarrow(b)bot(b-4a
设overrightarrow(a)=(1,1,4),overrightarrow(b)=(1,-2,2),则overrightarrow(a)+overrig
设overrightarrow(a)=(-1,1,2),overrightarrow(b)=(2,-2,-4),则向量|overrightarrow(a)×ov
设 overrightarrow(a) = (2, -3, 2), overrightarrow(b) = (-4, 6, 4), 则 cos(overrigh
已知|overrightarrow(a)•overrightarrow(b)|=3,|overrightarrow(a)×overrightarrow(b)|=
向量overrightarrow(a)、overrightarrow(b)、overrightarrow(c)两两垂直,且|overrightarrow(a)|
overrightarrow(a)=(1,0,1),overrightarrow(b)=(2,1,1),则overrightarrow(a)×overright
在平面直角坐标系xOy中.已知向量overrightarrow(a)、overrightarrow(b),|overrightarrow(a)|=|overri
设向量 overrightarrow (a)=(1,2,3) 、 overrightarrow (b)=(2,0,1), 则向量 overrightarrow
已知|overrightarrow(a)|=2,|overrightarrow(b)|=sqrt(3),overrightarrow(a)与overrighta