共50条信息
已知\(\overset{\to }{{a}}\,=\left( -6,2 \right)\),\(\overset{\to }{{b}}\,=\left( m,-3 \right)\),且\(\overset{\to }{{a}}\,\parallel \overset{\to }{{b}}\,\),则\(m=\)_____________.
如图,在\(Δ\) \(OBC\)中, \(A\)是 \(BC\)的中点, \(D\)是 \(OB\)的靠近 \(B\)点的一个三等分点, \(CD\)与 \(OA\)交于点 \(E\)\(.\)若 \(\overrightarrow{OE}=\lambda \overrightarrow{OA}\),求实数 \(\lambda \)的值.
向量\(\overrightarrow{a}=(n,1) \) 与\(\overrightarrow{b}=(4,n) \)共线且方向相同,则\(n=\)\(\_\) \(\_\) __ .
已知平面向量\(\overrightarrow{a}=(1,2)\),\(\overrightarrow{b}=(-2,k)\),若\(\overrightarrow{a}\)与\(\overrightarrow{b}\)共线,则\(\left| 3\overrightarrow{a}+\overrightarrow{b} \right|\)为______________\(;\)
已知\(D\)为\({\triangle }{ABC}\)的边\(AB\)上的一点,且\(\overrightarrow{{CD}}{=}\dfrac{1}{3}\overrightarrow{{AC}}{+}\lambda{⋅}\overrightarrow{{BC}}\),则实数\(\lambda\)的值为\(({ })\)
\(∆ABC \)的内角\(A\),\(B\),\(C\)所对的边分别为\(a\),\(b\),\(c\)向量\(\overrightarrow{m}=(a, \sqrt{3}b) \)与\(\overrightarrow{n}=(\cos A,\sin B) \)平行.
已知向量\(\overrightarrow{a}=(1,1), \overrightarrow{b}=(-1,2) \),若\(( \overrightarrow{a}- \overrightarrow{b})/\!/(2 \overrightarrow{a}+t \overrightarrow{b}) \),则\(t=(\) \()\)
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