优优班--学霸训练营 > 知识点挑题
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            • 1.

              过抛物线\({x}^{2}=2py\left(p > 0\right) \)的焦点作斜率为\(1\)的直线与该抛物线交于\(A\),\(B\)两点,\(A\),\(B\)在\(x\)轴上的正射影分别为\(D\),\(C.\)若梯形\(ABCD\)的面积为\(12 \sqrt{2} \),则\(p=\)______.

            • 2.

              已知点\(M\)在抛物线\({{y}^{2}}=6x\)上,\(N\)为抛物线的准线\(l\)上一点,\(F\)为该抛物线的焦点,若\(\overrightarrow{FN}=\overrightarrow{MF}\),则直线\(MN\)的斜率为\((\)   \()\)

              A.\(±\sqrt{2}\)
              B.\(±l\)
              C.\(±2\)
              D.\(±\sqrt{3}\)
            • 3.

              设椭圆\(\dfrac{x^{2}}{a^{2}}+\dfrac{y^{2}}{b^{2}}=1(a > b > 0)\)的右焦点与抛物线\(y^{2}=8x\)的焦点相同,离心率为\(\dfrac{1}{2}\),则此椭圆的方程为____.

            • 4.

              若抛物线\({y}^{2}=8x \)上一点\(P\)到其焦点的距离为\(9\),则点\(P\)的坐标为\((\)   \()\)。

              A.\(\left(7,± \sqrt{14}\right) \)
              B.\(\left(14,± \sqrt{14}\right) \)
              C.\(\left(7,±2 \sqrt{14}\right) \)
              D.\(\left(-7,±2 \sqrt{14}\right) \)
            • 5.
              直线\(l\)过抛物线\(C\):\(y^{2}=2px(p > 0)\)的焦点且与\(x\)轴垂直,\(l\)与\(C\)交于\(A\)、\(B\)两点,\(P\)为\(C\)的准线上一点,若\(\triangle ABP\)的面积为\(36\),则\(p\)的值为\((\)  \()\)
              A.\(3\)
              B.\(6\)
              C.\(12\)
              D.\(6 \sqrt {2}\)
            • 6.

              已知以\(F\)为焦点的抛物线\(y^{2}=4x\)上的两点\(A\),\(B\)满足\(AF=3FB\),那么弦\(AB\)的中点到准线的距离为________.

            • 7.

              抛物线\({x}^{2}= \dfrac{1}{2}y \)在第一象限内图像上的一点\(\left({a}_{i},2{{a}_{i}}^{2}\right) \)处的切线与 \(x\) 轴交点的横坐标记为\({a}_{i+1} \),其中\(i∈{N}^{*} \),若\({a}_{2}=32 \),则\({a}_{2}+{a}_{4}+{a}_{6} \)等于(    )

              A.\(21\)                
              B.\(32\)                   
              C.\(42\)
              D.\(64\)
            • 8.

              已知抛物线\(C\):\(y^{2}=2px(p > 0)\)的焦点为\(F\),抛物线\(C\)上一点\((3,m)\)到焦点的距离为\(5\).

              \((1)\)求抛物线\(C\)的方程;

              \((2)\)过点\(F\)作直线\(l\)交抛物线\(C\)于\(A\),\(B\)两点,若线段\(AB\)中点的纵坐标为\(-1\),求直线\(l\)的方程.

            • 9. 抛物线\(y=4x^{2}\)上一点到直线\(y=4x-5\)的距离最短,则该点的坐标是\((\)  \()\)
              A.\((1,2)\)
              B.\((0,0)\)
              C.\(( \dfrac {1}{2},1)\)
              D.\((1,4)\)
            • 10.

              过点\(M(\dfrac{\sqrt{2}}{2},-\dfrac{\sqrt{2}}{2})\)作圆\({{x}^{2}}+{{y}^{2}}=1\)的切线\(l\),\(l\)与\(x\)轴的交点为抛物线\(E:{{y}^{2}}=2px(p > 0)\)的焦点,\(l\)与抛物线\(E\)交于\(A,B\)两点,则\(AB\)中点到抛物线\(E\)的准线的距离为\((\)     \()\)

              A.\(4\sqrt{2}\)        
              B.\(3\sqrt{2}\)
              C.\(\dfrac{7\sqrt{2}}{2}\)
              D.\(\dfrac{5\sqrt{2}}{2}\)
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