共50条信息
已知\(\vec{a}=(3,-2,1)\),\(\overrightarrow{b}=(-2,4,0)\),\(\overrightarrow{c}=(3,0,2)\),则\(\overrightarrow{a}-2\overrightarrow{b}+4\overrightarrow{c}=\)_______.
已知向量\(p\)在基底\(\{a,b,c\}\)下的坐标为\((8,6,4)\),其中\(a=i+j\),\(b=j+k\),\(c=k+i\),则向量\(p\)在基底\(\{i,j,k\}\)下的坐标是( )
向量\(a\)\(=(-2,-3,1)\),\(b\)\(=(2,0,4)\),\(c\)\(=(-4,-6,2)\),下列结论正确的是\((\) \()\)
若\(\overrightarrow{a}{=}\left( 2{,}{-}1{,}0 \right)\),\(\overrightarrow{b}{=}(3{,}{-}4{,}7)\),且\((\lambda \overrightarrow{a}+\overrightarrow{b})⊥\overrightarrow{a}\)则\(\lambda\lambda \)的值是\((\) \()\)
已知\( \overset{⇀}{a}=\left(3,2,-1\right) \),\( \overset{⇀}{b}=\left(x,-4,2\right) \),且\(\overrightarrow{a}\bot \overrightarrow{b}\),则\(x=\)_______.
进入组卷