共50条信息
如果两条直线\(l_{1}\)与\(l\)垂直,则它们的斜率之积一定等于\(-1.(\) \()\)
已知直线\(l_{1}:mx-y+3=0\)与\(l_{2}\)关于直线\(y=x\)对称, \(l_{2}\)与\(l_{3}:y=-\dfrac{1}{2}x+\dfrac{1}{2}\)垂直,则\(m=\) \((\) \()\)
已知两圆相交于\(A(1,3)\),\(B(m,-1)\),两圆的圆心均在直线\(x-y+c=0\)上,则\(m+2c\)的值为( )
已知点\(A(1,2)\),\(B(3,1)\),则线段\(AB\)的垂直平分线\(l\)的方程是( )
若曲线\(y={{x}^{2}}-1\)与\(y=1+{{x}^{3}}\)在点\(x={{x}_{0}}\)处的切线互相垂直,则\({x}_{0} \)等于
已知直线\(l_{1}\):\(A_{1}x+B_{1}y+C_{1}=0\),\(l_{2}\):\(A_{2}x+B_{2}y+C_{2}=0(A_{1},B_{1},C_{1},A_{2},B_{2},C_{2}\)为常数\()\),若直线\(l_{1}⊥l_{2}\),则\(A_{1}A_{2}+B_{1}B_{2}=0.(\) \()\)
已知\(a > 0\), \(b > 0\), 两直线\({{l}_{1}}:(a-1)x+y-1=0\),\({{l}_{2}}:x+2by+1=0\),且\({{l}_{1}}\bot {{l}_{2}}\),则\(\dfrac{2}{a}+\dfrac{1}{b}\)的最小值为
已知直线\(l\)与过点\(M(-\sqrt{3},\sqrt{2})\),\(N(\sqrt{2},-\sqrt{3})\)的直线垂直,则直线\(l\)的倾斜角是\((\) \()\)
若直线\(l_{1}\):\(2x-ay-1=0\)过点\((1,1)\),\(l\):\(x+2y=0\),则直线\(l_{1}\)与\(l\)
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