共50条信息
已知\(A\left( 0,1 \right)\),\(B\left( \sqrt{2},0 \right)\),\(O\)为坐标原点,动点\(P\)满足\(\left| \overrightarrow{OP} \right|=2\),则\(\left| \overrightarrow{OA}+\overrightarrow{OB}+\overrightarrow{OP} \right|\)的 最小值为( )
\(\Delta ABC\)中,已知\(\angle C=\dfrac{\pi }{2}\),\(\left| \overrightarrow{AC} \right| < \left| \overrightarrow{BC} \right|\),\(\overrightarrow{CO}=\dfrac{1}{2}\lambda \overrightarrow{CA}+(1-\lambda )\overrightarrow{CB}(0 < \lambda < 1)\),则\(\left| \overrightarrow{CO} \right|\)取最小时有
化简\(( \overrightarrow{AB}- \overrightarrow{CD})-( \overrightarrow{AC}- \overrightarrow{BD}) \)__________\(;\)
如图所示,设 \(M\), \(N\), \(P\)是\(\triangle \) \(ABC\)三边上的点,且\( \overrightarrow{BM} = \dfrac{1}{3} \overrightarrow{BC} \),\( \overrightarrow{CN} = \dfrac{1}{3} \overrightarrow{CA} \),\( \overrightarrow{AP} = \dfrac{1}{3} \overrightarrow{AB} \),若\( \overrightarrow{AB} =\) \(a\),\( \overrightarrow{AC} =\) \(b\),试用 \(a\), \(b\)将\( \overrightarrow{MN} \),\( \overrightarrow{NP} \),\( \overrightarrow{PM} \)表示出来.
若非零向量\(\overrightarrow{AB}\)与\(\overrightarrow{AC}\)满足\((\dfrac{\overrightarrow{AB}}{|\overrightarrow{AB}|}+\dfrac{\overrightarrow{AC}}{|\overrightarrow{AC}|})\bullet \overrightarrow{BC}=0\),且\(\dfrac{\overrightarrow{AB}}{|\overrightarrow{AB}|}\bullet \dfrac{\overrightarrow{AC}}{|\overrightarrow{AC}|}=\dfrac{1}{2}\),则\(\Delta ABC\)为\((\) \()\)
进入组卷