共50条信息
已知\(\overrightarrow{AB}\)与\(\overrightarrow{AC}\)的夹角为\(90^{\circ}\),\(\overrightarrow{|AB|}=2\),\(\overrightarrow{AC}=1\),\(\overrightarrow{AM}=\lambda \overrightarrow{AB}+\mu \overrightarrow{AC}(λ,μ∈R)\),且\(\overrightarrow{AM}\cdot \overrightarrow{BC}=0\),则\(\dfrac{\lambda }{\mu }\)的值为________.
已知向量\(a=(2,1)\),\(b=(-3,2)\),向量\(c\)满足\(c⊥(a+b)\),且\(b/\!/(c-a)\),则\(c=\)________.
已知向量\(a=(-1,2)\),\(b=(m,1)\),若向量\(a+ b\)与\(a\)垂直,则\(m=\)_________.
已知向量\(a=(3,1)\),\(b=(1,3)\),\(c=(k,2)\),若\((a-c)⊥b\),则\(k=\)________.
已知动点\(P(x,y)\)在椭圆\(\dfrac{{{x}^{2}}}{25}+\dfrac{{{y}^{2}}}{16}=1\)上,若\(A\)点的坐标为\((3,0)\),\(|\overrightarrow{AM}|=1\),且\(\overrightarrow{PM}\cdot \overrightarrow{AM}=0\),则\(|\overrightarrow{PM}|\)的最小值为________.
若\(|a|=1\),\(|b|=2\),\(c=a+b\)且\(c⊥a\),则向量\(a\)与\(b\)的夹角为________.
已知向量\( \overset{→}{a}=(2,1), \overset{→}{b}=(-3,2) \),若\(( \overset{→}{a}+ \overset{→}{b})⊥(2 \overset{→}{a}-λ \overset{→}{b}) \),则\(λ =\) ______.
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