共50条信息
已知\(A(-2,0)\),\(B(0,2)\),点\(M\)是圆\(x^{2}+y^{2}-2x=0\)上的动点,则点\(M\)到直线\(AB\)的最大距离是\((\) \()\)
\((1)\)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\(r=\)________.
抛物线\(y={{x}^{2}}-2x-3\)与坐标轴的交点在同一个圆上,则交点确定的圆的方程为 \((\) \()\)
.已知圆\(M\)\(:\)\(x\)\({\,\!}^{2}\)\(+y\)\({\,\!}^{2}\)\(+\)\(2\)\(mx-\)\(3\)\(=\)\(0(\)\(m < \)\(0)\)的半径为\(2\),椭圆\(C\)\(: \dfrac{{x}^{2}}{{a}^{2}}+ \dfrac{{y}^{2}}{3} \)\(=\)\(1\)的左焦点为\(F\)\((\)\(-c\),\(0)\),若垂直于\(x\)轴且经过\(F\)点的直线\(l\)与圆\(M\)相切,则\(a\)的值为\((\) \()\)
\((1)\)若方程\(C\)表示圆,求实数\(m\)的范围;
\((2)\)在方程\(C\)表示圆时,若该圆与直线\(l\):\(x+2y-4=0\)相交于\(M\),\(N\)两点,且\(\left| {MN} \right|=\dfrac{4\sqrt{5}}{5}\),求实数\(m\)的值.
若方程\({{x}^{2}}+{{y}^{2}}-x+y+m=0\)表示圆,则实数\(m\)的取值范围是( )
过点\(A(0,6)\)且与圆\(C\):\(x^{2}+y^{2}+10x+10y=0\)切于原点的圆的方程为________.
抛物线\(y\)\({\,\!}^{2}=4\)\(x\)与过其焦点且垂直于\(x\)轴的直线相交于\(A\),\(B\)两点,其准线与\(x\)轴的交点为\(M\),则过\(M\),\(A\),\(B\)三点的圆的标准方程是( ).
方程\((x^{2}-4)^{2}+(y^{2}-4)^{2}=0\)表示的图形是\((\) \()\)
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