共50条信息
已知向量\(a=(-1,2)\),\(b=(m,1)\),若向量\(a+ b\)与\(a\)垂直,则\(m=\)_________.
在四边形\(ABCD\)中,若\(\overrightarrow{AB}+\overrightarrow{CD}=0\),\(\overrightarrow{AC}\cdot \overrightarrow{BD}=0\),则四边形为 \((\) \()\)
已知向量\(p=\left( 1,2 \right),q=\left( x,3 \right)\),若\(\overrightarrow{p}\bot \overrightarrow{q}\),则\(|\overrightarrow{p}+\overrightarrow{q}|=\)_________.
已知\(|\overrightarrow{a}|=1\),\(|\overrightarrow{b}|=\sqrt{2}\),且\(\overrightarrow{a}\bot \overrightarrow{b}\),则\(|\overrightarrow{a}+\overrightarrow{b}|\)为\((\) \()\)
已知非零向量\( \overrightarrow{a}, \overrightarrow{b} \)满足\(\left| \overrightarrow{a} \right|=\dfrac{2\sqrt{2}}{3}\left| \overrightarrow{b} \right|\),且\((\overrightarrow{a}\ -\ \overrightarrow{b})\bot (3\overrightarrow{a}\ +2\ \overrightarrow{b})\),则\( \overrightarrow{a}, \overrightarrow{b} \)的夹角为
已知向量\(\overrightarrow{a}{=}(\cos\alpha{,}1){,}\overrightarrow{b}{=}({-}2{,}\sin\alpha){,}\alpha{∈}(\pi{,}\dfrac{3\pi}{2})\),且\(\overrightarrow{a}{⊥}\overrightarrow{b}(1)\)\((1)\)求\(\sin\alpha\)的值;\((2)\)求\(\tan(\alpha{+}\dfrac{\pi}{4})\)的值.
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