共50条信息
已知向量\(a=\left(2, \dfrac{x}{2},x\right),b=\left(x,1,2\right) \),其中\(x > 0 \),若\(a/\!/b \),则\(x=\) .
已知两个向量\(\overrightarrow{a}=(2,-1,3)\),\(\overrightarrow{b}=(4,m,n)\),且\(\overrightarrow{a}\parallel \overrightarrow{b}\),则\(m+n\)的值为\((\) \()\)
向量\(a\)\(=(-2,-3,1)\),\(b\)\(=(2,0,4)\),\(c\)\(=(-4,-6,2)\),下列结论正确的是\((\) \()\)
已知向量\(a=(3,-1,2),b=(x,y,-4)\),且\(a/\!/b\),则\(x+y=(\) \()\)
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