共50条信息
已知直线\({{l}_{1}}:2x+y-2=0,{{l}_{2}}:ax+4y+1=0\),若\({{l}_{1}}\bot {{l}_{2}}\),则\(a\)的值为\((\) \()\)
两直线\(3x+2y+m=0\)和\((m^{2}+1)x-3y-3m=0\)的位置关系是\((\) \()\)
已知直线\({{l}_{1}}\):\(x{\sin }\alpha +y-1=0\),直线\({{l}_{2}}\):\(x-3y{\cos }\alpha +1=0\),若\({{l}_{1}}\bot {{l}_{2}}\),则\({\sin }2\alpha =(\) \()\).
已知曲线\(f(x)=k{{e}^{-x}}\)在点\(x=0\)处的切线与直线\(x-2y-1=0\)垂直,若\({{x}_{1}},{{x}_{2}}\)是函数\(g(x)=f(x)-\left| \ln x \right|\)的两个零点,则\((\) \()\)
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