优优班--学霸训练营 > 知识点挑题
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            • 1.

              已知点\(P\)在直线\(x+2y-1=0\)上,点\(Q\)在直线\(x+2y+3=0\)上,\(PQ\)的中点为\(M(x_{0},y_{0})\),且\(y_{0} > x_{0}+2\),则\(\dfrac{{{y}_{0}}}{{{x}_{0}}}\)的取值范围是

              A.\(\left( \dfrac{1}{5},1 \right)\)
              B.\(\left( -\dfrac{1}{2},\dfrac{1}{5} \right)\)
              C.\(\left( -1,-\dfrac{1}{5} \right)\)
              D.\(\left( -\dfrac{1}{2},-\dfrac{1}{5} \right)\)
            • 2.

              已知\(P\)在直线\(l:2x+y-4=0\)上,点\(A(4,1)\),\(B(3,4)\),则\(|PA|+|PB|\)的最小值为 (    )

              A.\(\sqrt{{34}}\)
              B.\(\sqrt{{10}}\)
              C.\(\dfrac{{13}}{5}\sqrt{5}\)
              D.\(\dfrac{{7}\sqrt{{5}}}{{5}}\)
            • 3.

              已知点\(A(1,2)\),\(B(3,1)\),则线段\(AB\)的垂直平分线\(l\)的方程是(    )

              A.\(4x+2y=5\)
              B.\(4x-2y=5\)
              C.\(x+2y=5\)
              D.\(x-2y=5\)
            • 4.

              已知抛物线\(C:{y}^{2}=2px(p > 0) \)的焦点为\(F\),\(M(3,2)\),直线\(MF\)交抛物线于\(A\),\(B\)两点,且\(M\)为\(AB\)的中点,则\(p\)的值为(    )

              A.\(3\)               
              B.\(2\)或\(4\)           
              C.\(4\)               
              D.\(2\)
            • 5.

              已知椭圆\(E:\dfrac{{{x}^{2}}}{{{a}^{2}}}+\dfrac{{{y}^{2}}}{{{b}^{2}}}=1\left( a > b > 0 \right)\)的右焦点为\(F\left( 3,0 \right)\),过点\(F\)的直线交\(E\)于\(A,B\)两点,若\(AB\)的中点坐标为\(\left( 1,-1 \right)\),则\(E\)的方程为  \((\)   \()\)

              A.\(\dfrac{{{x}^{2}}}{45}+\dfrac{{{y}^{2}}}{36}=1\)
              B.\(\dfrac{{{x}^{2}}}{36}+\dfrac{{{y}^{2}}}{27}=1\)
              C.\(\dfrac{{{x}^{2}}}{27}+\dfrac{{{y}^{2}}}{18}=1\)
              D.\(\dfrac{{{x}^{2}}}{18}+\dfrac{{{y}^{2}}}{9}=1\)
            • 6.

              己知\(A(4\sin θ,6\cos θ)\),\(B(-4\cos θ,6\sin θ)\)当\(θ\)为一切实数时,线段\(AB\)的中点的轨迹为(    )

              A.直线
              B.圆
              C.椭圆
              D.双曲线
            • 7.
              在参数方程\( \begin{cases} \overset{x=a+t\cos \theta }{y=b+t\sin \theta }\end{cases}(t\)为参数\()\)所表示的曲线上有\(B\)、\(C\)两点,它们对应的参数值分别为\(t_{1}\)、\(t_{2}\),则线段\(BC\)的中点\(M\)对应的参数值是\((\)  \()\)
              A.\( \dfrac {t_{1}-t_{2}}{2}\)
              B.\( \dfrac {t_{1}+t_{2}}{2}\)
              C.\( \dfrac {|t_{1}-t_{2}|}{2}\)
              D.\( \dfrac {|t_{1}+t_{2}|}{2}\)
            • 8.
              已知点\(A(x,5)\)关于点\((1,y)\)的对称点\((-2,-3)\),则点\(P(x,y)\)到原点的距离是\((\)  \()\)
              A.\(4\)
              B.\( \sqrt {13}\)
              C.\( \sqrt {15}\)
              D.\( \sqrt {17}\)
            • 9.
              直线\( \begin{cases} x=1+ \dfrac {1}{2}t \\ y=-3 \sqrt {3}+ \dfrac { \sqrt {3}}{2}t\end{cases}(t{为参数})\)和圆\(x^{2}+y^{2}=16\)交于\(A\),\(B\)两点,则\(AB\)的中点坐标为\((\)  \()\)
              A.\((3,-3)\)
              B.\((- \sqrt {3},3)\)
              C.\(( \sqrt {3},-3)\)
              D.\((3,- \sqrt {3})\)
            • 10.
              已知两点\(O(0,0)\),\(Q(a,b)\),点\(P_{1}\)是线段\(OQ\)的中点,点\(P_{2}\)是线段\(QP_{1}\)的中点,\(P_{3}\)是线段\(P_{1}P_{2}\)的中点,\(┅\),\(P_{n+2}\)是线段\(P_{n}P_{n+1}\)的中点,则点\(P_{n}\)的极限位置应是\((\)  \()\)
              A.\(( \dfrac {a}{2}, \dfrac {b}{2})\)
              B.\(( \dfrac {a}{3}, \dfrac {b}{3})\)
              C.\(( \dfrac {2a}{3}, \dfrac {2b}{3})\)
              D.\(( \dfrac {3a}{4}, \dfrac {3b}{4})\)
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