优优班--学霸训练营 > 知识点挑题
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            • 1.

              \((1)\)命题\("∀{x}_{0}∈\left(0,+∞\right),\ln x+2\leqslant {e}^{{x}_{0}} "\)的否定是_______   

              \((2)\)已知函数\(f(x)=\begin{cases} & {{x}^{-{{m}^{2}}+2m+3}}(x\geqslant 1) \\ & (2m-1)x+m(x < 1) \end{cases}\)在\(R\)上是单调递增函数,则\(m\)的取值范围是__________________

              \((3)\) 如图,四面体\(ABCD\)的每条棱长都等于\(2\),点\(E\),\(F\)分别为棱\(AB\),\(AD\)的中点,则\(\left| \overrightarrow{AC}+\overrightarrow{EF} \right|=\)_____; \(\left| \overset{→}{BC}- \overset{→}{EF}\right| \) ___________;

              \((4)\)已知四棱锥\(P-ABCD\)的五个顶点都在球\(O\)的球面上,底面\(ABCD\)是矩形,平面\(PAD\)垂直于平面\(ABCD\),在\(\triangle PAD\)中,\(PA=PD=2\),\(∠APD=120^{\circ}\),\(AB=4\),则球\(O\)的表面积等于____  

            • 2. 已知三棱锥O-ABC,点M,N分别为AB,OC的中点,且,用a,b,c表示,则等于(  )
              A.
              B.
              C.
              D.
            • 3.

              已知\(\overrightarrow{OA}=(1,2,4),\overrightarrow{OB}=(2,1,1),\overrightarrow{OP}=(1,1,2)\),点\(Q\)在直线\(OP\)上运动,则当\(\overrightarrow{QA}\cdot \overrightarrow{QB}\)取得最小值时,点\(Q\)的坐标为___________。

            • 4.

              设 \(OABC\) 是四面体,\({G}_{1} \) 是\(∆ABC \) 的重心,\(G\) 是\(O{G}_{1} \) 上一点,且\(OG=3G{G}_{1} \),若\( \overrightarrow{OG}=x \overrightarrow{OA}+y \overrightarrow{OB}+z \overrightarrow{OC} \),则\(\left(x,y,z\right) \) 为

              A.\(\left( \dfrac{1}{4}, \dfrac{1}{4}, \dfrac{1}{4}\right) \)
              B.\(\left( \dfrac{3}{4}, \dfrac{3}{4}, \dfrac{3}{4}\right) \)
              C.\(\left( \dfrac{1}{3}, \dfrac{1}{3}, \dfrac{1}{3}\right) \)
              D.\(\left( \dfrac{2}{3}, \dfrac{2}{3}, \dfrac{2}{3}\right) \)
            • 5.

              \((1)\)抛物线\(y=4{{x}^{2}}\)的准线方程为___________.

              \((2)\)若“任意\(x∈R \),\({{x}^{2}}-2x-m > 0\)”是真命题,则实数\(m\)的取值范围是__________.

              \((3)\)过抛物线\({{y}^{2}}=2px\left( p > 0 \right)\)的焦点\(F\)作倾斜角为\(45^{\circ}\)的直线交抛物线于\(A\)、\(B\)两点,若线段\(AB\)的长为\(8\),则\(p =\)___________.

              \((4)\)已知圆\({{x}^{2}}+{{y}^{2}}-4x-9=0\)与\(y\)轴的两个交点\(A\),\(B\)都在某双曲线上,且\(A\),\(B\)两点恰好将此双曲线的焦距三等分,则此双曲线的标准方程为

              \((5)\)如图,在空间四边形\(ABCD\)中,\(AC\)\(BD\)为对角线,\(G\)为\(\triangle \)\(ABC\)的重心,\(E\)\(BD\)上一点,\(BE=3ED \),以\(\{ \overset{⇀}{AB}, \overset{⇀}{AC}, \overset{⇀}{AD} \}\)为基底,则\(=\)__________.

            • 6.

              \((1)\)已知\(p\)\(x\)\({\,\!}^{2}-2\)\(x\)\(-3\leqslant 0\);\(q: \dfrac{1}{X-2}\leqslant 0 \),若\(p\)\(q\)为真,则\(x\)的取值范围是 ______.

              \((2)\)等差数列\(\{\)\(a_{n}\)\(\}\)中,\(a\)\({\,\!}_{1}=25\),\(S_{17}=S_{9}\),则当\(n\)\(= \)______时,\(S\)\({\,\!}_{n}\)有最大值.

              \((3)\)平行四边形\(ABCD\)中,\(E\)为\(CD\)的中点,动点\(G\)在线段\(BE\)上,\( \overrightarrow{AG}=x \overrightarrow{AB}+y \overrightarrow{AD} \),则\(2\)\(x\)\(+\)\(y\)\(= \)______.

              \((4)\)已知\(\triangle ABC\)中,\(AB=2 \sqrt{3} \),\(AC+ \sqrt{3} BC=6\),\(D\)为\(AB\)的中点,当\(CD\)取最小值时,\(\triangle ABC\)面积为 ______.

            • 7.

              已知长方体\(ABCD-{{A}_{1}}{{B}_{1}}{{C}_{1}}{{D}_{1}}\),化简向量表达式\(\overrightarrow{CB}+\overrightarrow{AC}+\overrightarrow{AD}+\overrightarrow{A{{A}_{1}}}=\)_____________;

            • 8.

              已知空间三点\(A(0,2,3)\),\(B(-2,1,6)\),\(C(1,-1,5)\),

              \((1)\)求以向量\(\overset{\to }{{AB}}\,,\overset{\to }{{AC}}\,\)为一组邻边的平行四边形的面积\(S\).

              \((2)\)若向量\(\overset{\to }{{a}}\,\)分别与向量\(\overset{\to }{{AB}}\,,\overset{\to }{{AC}}\,\)垂直,且\(|\overset{\to }{{a}}\,|=\sqrt{3}\) ,求向量\(\overset{\to }{{a}}\,\)的坐标.

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