优优班--学霸训练营 > 知识点挑题
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            • 1.

              给出下列命题:

              \(①\)已知圆\(C:x^{2}+y^{2}=1\)外一点\(P(3,4)\),过点\(P\)作圆\(C\)的切线,切点分别为点\(A\)、\(B\),则\(AB\)所在的直线方程为\(3x+4y-2=0\);

              \(②\)已知\(BC\)是圆\(x^{2}+y^{2}=25\)的动弦,且\(|BC|=6\),则\(BC\)的中点的轨迹方程是\(x^{2}+y^{2}=16\);

              \(③\)已知\(A\)、\(B\)两点的坐标分别为\(A(x_{1},y_{1})\)、\(B(x_{2},y_{2})\),则以\(AB\)为直径的圆的方程为:\((x-x_{1})(x-x_{2})+(y-y_{1})(y-y_{2})=0\);

              \(④\)已知直角坐标系中圆\(C\)方程为\(F(x,y)=0\),\(P(x_{0},y_{0})\)为圆内一点\((\)非圆心\()\),那么方程\(F(x,y)=F(x_{0},y_{0})\)所表示的曲线是比圆\(C\)半径小,与圆\(C\)同心的圆;

              \(⑤\)曲线\(x^{2}+y^{2}-|x|-|y|=0\)围成的图形的面积为\(π\).

              其中正确的命题为_________.

            • 2.

              已知圆\(C\)的圆心在\(x\)轴的正半轴上,点\(M(0,\sqrt{5})\)在圆\(C\)上,且圆心到直线\(2x-y=0\)的距离为\(\dfrac{4\sqrt{5}}{5}\),那么圆\(C\)的方程为________.

            • 3.

              若点集\(A=\{(x,y)|{{x}^{2}}+{{y}^{2}}\leqslant 1\},B=\{(x,y)|-1\leqslant x\leqslant 1,-1\leqslant y\leqslant 1\}\),则点集\(P=\left\{ (x,y)\left| x={{x}_{1}}+1,y={{y}_{1}}+1 \right. \right.,({{x}_{1}},{{y}_{1}})\in A\}M=\{(x,y)|x={x}_{1}+{x}_{2},y={y}_{1}+{y}_{2} ,(x_{1},y_{1})∈A,({x}_{2},{y}_{2})∈B\} \)所表示的区域的面积分别为_______________;    _______________\(.\) 

            • 4.

              如图,已知圆\(C\)与\(x\)轴相切于点\(T(1,0)\),与\(y\)轴正半轴交于两点\(A\),\(B(B\)在\(A\)的上方\()\),且\(|AB|=2.\)则圆\(C\)在点\(B\)处的切线在\(x\)轴上的截距为________.

            • 5. 过点\(M(1,2)\)的直线\(l\)与圆\(C\):\((x-3)^{2}+(y-4)^{2}=25\)交于\(A\),\(B\)两点,\(C\)为圆心,当\(∠ACB\)最小时,直线\(l\)的方程是________.
            • 6.

              直线\(y=kx+1\)与圆\(M:x^{2}+y^{2}-2y=0\)的位置关系是____\(.\) 

            • 7.

              \((1)\)圆\({{x}^{2}}+{{y}^{2}}+2x-4y-3=0\)的圆心坐标为________,半径\(r=\)________;

                  \((2)\)圆\({{x}^{2}}+{{y}^{2}}+2mx=0\)的圆心坐标为________,半径\(r=\)________.

            • 8.

              \((1)\)已知满足\(x,y\)不等式组\(\begin{cases} & y\leqslant x \\ & x+y\geqslant 2 \\ & x\leqslant 2 \end{cases}\),则\(z=2x+y\)的最大值为_____________

              \((2)\)已知等差数列\(\{{{a}_{n}}\}\)的公差为\(d\),若\({{a}_{1}},{{a}_{2}},{{a}_{3}},{{a}_{4}},{{a}_{5}}\)的方差为\(8\), 则\(d\)的值为__________.

              \((3)\)圆心在抛物线\(y=\dfrac{1}{2}{{x}^{2}}(x < 0)\)上,并且和该抛物线的准线及\(y\)轴都相切的圆的标准方程为______.

              \((4)\)已知函数\(f(x)=3mx-\dfrac{1}{x}-(3+m)\ln x\),若对任意的\(m\in (4,5),{{x}_{1}},{{x}_{2}}\in [1,3]\),恒有\((a-\ln 3)m-3\ln 3 > \left| f({{x}_{1}})-f({{x}_{2}}) \right|\)成立,则实数\(a\)的取值范围是 __________________

            • 9.

              将圆\(x^{2}+y^{2}=1\)沿\(x\)轴负方向平移\(1\)个单位后得到圆\(C\),则圆\(C\)的标准方程是_____;若过点\((1,0)\)的直线\(l\)和圆\(C\)相切,则直线\(l\)的斜率是_______

            • 10.

              \((1)\)以点\(M(2,0)\)、\(N(0,4)\)为直径的圆的标准方程为________.

              \((2)\)在等差数列\(\{a_{n}\}\)中,\(a_{n} > 0\),\({{a}_{7}}=\dfrac{1}{2}{{a}_{4}}+4\),\(S_{n}\)为数列\(\{a_{n}\}\)的前\(n\)项和,\(S_{19}=\)________.

              \((3)\)已知点\(P(a,b)\)在函数\(y=\dfrac{{{e}^{2}}}{x}\)上,且\(a > 1\),\(b > 1\),则\(a^{\ln b}\)的最大值为________.

              \((4)\)已知双曲线\(C_{2}\)与椭圆\(C_{1}\):\(\dfrac{{{x}^{2}}}{4}+\dfrac{{{y}^{2}}}{3}=1\)具有相同的焦点,则两条曲线相交四个交点形成四边形面积最大时双曲线\(C_{2}\)的离心率为________.

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