优优班--学霸训练营 > 知识点挑题
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            • 1. \(18.\)如图,三棱柱 \(ABC\)\(­\) \(A\)\({\,\!}_{1}\) \(B\)\({\,\!}_{1}\) \(C\)\({\,\!}_{1}\)中,侧面 \(BB\)\({\,\!}_{1}\) \(C\)\({\,\!}_{1}\) \(C\)为菱形, \(AB\)\(⊥\) \(B\)\({\,\!}_{1}\) \(C\)

              \((1)\)证明:\(AC\)\(=\)\(AB\)\({\,\!}_{1}\);

              \((2)\)若\(AC\)\(⊥\)\(AB\)\({\,\!}_{1}\),\(∠\)\(CBB\)\({\,\!}_{1}=60^{\circ}\),\(AB\)\(=\)\(BC\),求二面角\(A\)\(­\)\(A\)\({\,\!}_{1}\)\(B\)\({\,\!}_{1}­\)\(C\)\({\,\!}_{1}\)的余弦值.


            • 2.

              \((1)\)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\(=\)__________.

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