按第一行展开,行列式i j k-|||-1 2 3 =3overrightarrow (i)-3overrightarrow (j)-3overrightarrow (k)-|||-2 1 3A 正确B 错误

已知(overrightarrow{OA)= overrightarrow(i)+ 3overrightarrow(k)}，(overrightarrow{OB

一质点的运动方程为overrightarrow (r)(t)=3overrightarrow (i)-7toverrightarrow (j)+2(t)^3ov

overrightarrow (a)=overrightarrow (i)-2overrightarrow (j)+3overrightarrow (k) 在y

按第一行展开，行列式}overrightarrow(i)&overrightarrow(j)&overrightarrow(k)1&2&32&1&3A. 对B.

若矢量 overrightarrow (a)+3overrightarrow (b) 垂直于 overrightarrow (a)-5overrightarro

[题目]已知 overrightarrow (OA)=i+3k, overrightarrow (OB)=overrightarrow (j)+3k 求 Del

已知overrightarrow (i)=(2,3,-1) , overrightarrow (i)=(2,3,-1)，overrightarrow (i)=(

[题目]向量 overrightarrow (a)=-overrightarrow (i)+2overrightarrow (j)+overrightarrow

8.已知 overrightarrow (OA)=i+3k, overrightarrow (OB)=j+3k, 求 Delta ABO 的面积.

已知质点的运动方程为=5(t)^2overrightarrow (i)+3toverrightarrow (j)+4overrightarrow (k)，则=5