A. $\sqrt{10}$
B. -$\sqrt{14}$
C. -$\sqrt{10}$
D. $\sqrt{14}$
设overrightarrow(a)=(-1,1,2),overrightarrow(b)=(2,-2,-4),则向量|overrightarrow(a)×ov
已知向量overrightarrow(a)=(0,1),overrightarrow(b)=(2,x),若overrightarrow(b)⊥(overrigh
已知|overrightarrow(a)•overrightarrow(b)|=3,|overrightarrow(a)×overrightarrow(b)|=
当overrightarrow(a),overrightarrow(b)满足( )时,有|overrightarrow(a)-overrightarrow(b)
设未知向量 overrightarrow(x)与 overrightarrow(a) = (2, -1, 2)共线,且满足 overrightarrow(a)
在平面直角坐标系xOy中.已知向量overrightarrow(a)、overrightarrow(b),|overrightarrow(a)|=|overri
10证明:若 overrightarrow (a)times overrightarrow (b)+overrightarrow (b)times overri
overrightarrow(a)=(1,0,1),overrightarrow(b)=(2,1,1),则overrightarrow(a)×overright
若矢量 overrightarrow (a)+3overrightarrow (b) 垂直于 overrightarrow (a)-5overrightarro
[题目]设 |overrightarrow (a)|=3,, |overrightarrow (b)|=4,, |overrightarrow (c)|=5,