[题目]设 |overrightarrow (a)|=3,, |overrightarrow (b)|=4,, |overrightarrow (c)|=5, 且满足-|||-overrightarrow (a)+overrightarrow (b)+overrightarrow (c)=0, 则 |overrightarrow (a)times overrightarrow (b)+overrightarrow (b)times overrightarrow (c)+overrightarrow (c)times overrightarrow (a)|= __ .

[题目]设 |overrightarrow (a)|=4 |overrightarrow (b)|=3 , langle overrightarrow (a),

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)|=

设未知向量 overrightarrow(x)与 overrightarrow(a) = (2, -1, 2)共线，且满足 overrightarrow(a)

设 overrightarrow(a) = (2, -3, 2), overrightarrow(b) = (-4, 6, 4), 则 cos(overrigh

向量overrightarrow(a)、overrightarrow(b)、overrightarrow(c)两两垂直，且|overrightarrow(a)|

当overrightarrow(a)，overrightarrow(b)满足（ ）时，有|overrightarrow(a)-overrightarrow(b)

设overrightarrow(a)=（-1，1，2），overrightarrow(b)=（2，-2，-4），则向量|overrightarrow(a)×ov

设overrightarrow(a)=（1，-1，2），overrightarrow(b)=（3，-2，-1），则overrightarrow(a)×overr

设overrightarrow(a)=（1，1，4），overrightarrow(b)=（1，-2，2），则overrightarrow(a)+overrig