共50条信息
已知\({|}\overrightarrow{a}{|=}3{,}{|}\overrightarrow{b}{|=}5{,}\overrightarrow{a}{⋅}\overrightarrow{b}{=}12\),则向量\(\overrightarrow{a}\)在向量\(\overrightarrow{b}\)上的投影为\((\ \ \ \ \ \ \ \ \ { })\)
若\(\overrightarrow{a}{=}(2{,}3){,}\overrightarrow{b}{=}({-}4{,}7)\),则\(\overrightarrow{a}\)在\(\overrightarrow{b}\)方向上的投影为\(({ })\)
已知向量\( \overset{→}{a} =(1, \sqrt{3} )\),\( \overset{→}{b} =(3,m)\),若向量\( \overset{→}{b} \)在\( \overset{→}{a} \)方向上的投影为\(3\),则实数\(m=\)( )
已知\(|\overrightarrow{a}|=2\),\(2\overrightarrow{a}-\overrightarrow{b}\bot \overrightarrow{a}\),则\(\overrightarrow{b}\)在\(\overrightarrow{a}\)方向上的投影为\((\) \()\)
如果\( \overset{→}{a}· \overset{→}{b}= \overset{→}{a}· \overset{→}{c} \)且\( \overset{→}{a} \neq 0\),那么\((\) \()\)
已知\(| \overrightarrow{a}|=6,| \overrightarrow{b}|=3, \overrightarrow{a}· \overrightarrow{b}=-12 \),则向量\(\overset{\to }{{a}}\,\)在向量\(\overset{\to }{{b}}\,\)方向上的投影为( )
已知\(\left| \overset{⇀}{a}\right|=2 \), \(\left| \overset{⇀}{b}\right|=1 \),\(\overrightarrow{a}\cdot \overrightarrow{b}=1\),则向量\(\overrightarrow{a}\)在\(\overrightarrow{b}\)方向上的投影是
进入组卷