共50条信息
已知圆\(C\):\(x^{2}+y^{2}-4x-14y+45=0\)及点\(Q(-2,3)\).
\((\)Ⅰ\()\)若\(M\)为圆\(C\)上任一点,求\(|MQ|\)的最大值和最小值;
\((\)Ⅱ\()\)若实数\(m\),\(n\)满足\(m^{2}+n^{2}-4m-14n+45=0\),求\(k= \dfrac{n-3}{m+2} \)的最大值和最小值.
已知倾斜角为\(\theta \)的直线\(l\)与直线\(x+2y-3=0\)垂直,则\(\cos 2θ \)的值为________
已知点\(P\)在直线\(x+3y-2=0\)上,点\(Q\)在直线\(x+3y+6=0\)上,线段\(PQ\)的中点为\(M\left({x}_{0},{y}_{0}\right) \),且\({{y}_{0}} < {{x}_{0}}+2\),则\(\dfrac{{{y}_{0}}}{{{x}_{0}}}\)的取值范围是
已知圆\(C:{{\left( x-2 \right)}^{2}}+{{\left( y-3 \right)}^{2}}=4\)外的有一点\(P\left( 4,-1 \right)\),过点\(P\)作直线\(l\).
\((1)\)当直线\(l\)与圆\(C\)相切时,求直线\(l\)的方程;
\((2)\)当直线\(l\)的倾斜角为\({{135}^{0}}\)时,求直线\(l\)被圆\(C\)所截得的弦长.
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