化简:(1)overrightarrow(BC)+overrightarrow(AB);(2)overrightarrow(DB)+overrightarrow
若 overrightarrow (a)cdot overrightarrow (b)=0, 则k的值-|||-为 __-|||-(2)在 Delta ABC
若向量 overrightarrow(AB)=(-1,2), overrightarrow(BC)=(3,-2), 则 overrightarrow(AC) 等
设overrightarrow(a)=(1,1,4),overrightarrow(b)=(1,-2,2),则overrightarrow(a)+overrig
设 overrightarrow(a) = 3, 5, -2,overrightarrow(b) = 2, 1, 4,且已知 lambda overri
已知|overrightarrow(a)•overrightarrow(b)|=3,|overrightarrow(a)×overrightarrow(b)|=
设overrightarrow(a)=(-1,1,2),overrightarrow(b)=(2,-2,-4),则向量|overrightarrow(a)×ov
overrightarrow (a)=overrightarrow (i)-2overrightarrow (j)+3overrightarrow (k) 在y
设overrightarrow(a)=(1,-1,2),overrightarrow(b)=(3,-2,-1),则overrightarrow(a)×overr
overrightarrow(a)=(1,0,1),overrightarrow(b)=(2,1,1),则overrightarrow(a)×overright