共50条信息
已知平面向量\(\overrightarrow{a}=\left( 1,-3 \right),\overrightarrow{b}=\left( 4,-2 \right)\),若\(\lambda \overrightarrow{a}-\overrightarrow{b}\)与\(\overrightarrow{a}\)垂直,则\(\lambda =\)( )
设\(A\),\(B\),\(C\)是圆\(x^{2}+y^{2}=1\)上不同的三个点,且\(\overrightarrow{OA}· \overrightarrow{OB}=0 \),若存在实数\(λ\),\(μ\),使得\(\overrightarrow{OC}=λ \overrightarrow{OA}+μ \overrightarrow{OB} \),则实数\(λ\),\(μ\)的关系为\((\) \()\)
在\(\triangle ABC\)中,\(\overrightarrow{BC}· \overrightarrow{AC}- \overrightarrow{AB}· \overrightarrow{AC}=| \overrightarrow{AC}{|}^{2} \),则\(\triangle ABC\)的形状一定是\((\) \()\)
\(\Delta ABC\)的三个内角\(A\),\(B\),\(C\)成等差数列, 且\((A\vec{B}+A\vec{C})\cdot B\vec{C}=0\)则\(\Delta ABC\)的 形状为\((\) \()\)
设非零向量\(a\),\(b\)满足\(|2a+b|=|2a-b|\),则
已知平面向量\( \overset{→}{a}=(1,-3) \),\( \overset{→}{b}=(4,-2) \),\(λ \overset{→}{a}+ \overset{→}{b} \)与\( \overset{→}{a} \)垂直,则\(λ\)是\((\) \()\)
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