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2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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限时跟踪检测(四十九) 圆的方程及直线与圆的位置关系 一、单项选择题 1.圆心为(2,1)且和x轴相切的圆的方程是( ) A.(x-2)2+(y-1)2=1 B.(x+2)2+(y+1)2=1 C.(x-2)2+(y-1)2=5 D.(x+2)2+(y+1)2=5 2.过点A(a,a)可作圆x2+y2-2ax+a2+2a-3=0的两条切线,则实数a的取值范围 是( ) A.(-∞,-3)∪(1,+∞) B. C.(-3,1)∪ D.(-∞,-3)∪ 3.点M,N是圆x2+y2+kx+2y-4=0上的不同两点,且点M,N关于直线l:x-y+ 1=0对称,则该圆的半径等于( ) A.2 B. C.3 D.9 4.(2024·山东滕州模拟)“点(a,b)在圆x2+y2=1外”是“直线ax+by+2=0与圆x2+ y2=1相交”的( ) A.充分不必要条件 B.必要不充分条件 C.充要条件 D.既不充分也不必要条件 5.若直线ax-by-6=0(a>0,b>0)始终平分圆x2+y2-4x+4y=0的周长,则+的最 小值为( ) A.1 B.2 C.3 D.4 6.圆(x-2)2+y2=4关于直线y=x对称的圆的方程是( ) A.(x-)2+(y-1)2=4 B.(x-)2+(y-)2=4 C.x2+(y-2)2=4 D.(x-1)2+(y-)2=4 7.已知圆C的半径为,其圆心C在直线x+y+2=0上,圆C上的动点P到直线kx-y -2k+2=0(k∈R)的距离的最大值为4,则圆C的标准方程为( ) A.(x+1)2+(y+1)2=2 B.(x+2)2+y2=2 C.(x+4)2+(y-2)2=2 D.(x+3)2+(y-1)2=2 8.若一条光线从点A(-2,-3)射出,经y轴反射后与圆(x+3)2+(y-2)2=1相切,则 反射光线所在直线的斜率为( ) A.-或- B.-或-C.-或- D.-或- 9.(2024·山西模拟)经过A(2,0),B(0,2),C(2,4)三点的圆与直线kx-y+2-4k=0的 位置关系为( ) A.相交 B.相切 C.相交或相切 D.无法确定 二、多项选择题 10.已知圆C:x2+y2+2mx-2(m+1)y+2m2+2m-3=0(m∈R)上存在两个点到点 A(0,-1)的距离为4,则m的值可能为( ) A.1 B.-1 C.-3 D.-5 11.(2024·辽宁锦州模拟)关于直线l:y=kx+m与圆C:x2+y2=4,下列说法正确的是 ( ) A.若直线l与圆C相切,则m2-4k2为定值 B.若m2-k2=1,则直线l被圆C截得的弦长为定值 C.若k=m+1,则直线l与圆C相离 D.“-23-2a,解得a<-3或a>1.所以a<-3或11,命题q:直线ax+by+2=0 与圆x2+y2=1相交等价于<1 a2+b2>4,从而有p \s\up7(\a\vs4\al(⇒)) q,q p,所以p是 q的必要不充分条件.故选B. ⇔ ⇒ 答案:B 5.若直线ax-by-6=0(a>0,b>0)始终平分圆x2+y2-4x+4y=0的周长,则+的最小值为( ) A.1 B.2 C.3 D.4 解析:圆x2+y2-4x+4y=0,即(x-2)2+(y+2)2=8,圆心为(2,-2),依题意,点 (2,-2)在直线ax-by-6=0上,则有2a-(-2)b-6=0,整理得a+b=3,而a>0, b>0,于是得+=(a+b)=2++≥2+2=4,当且仅当a=b=时取等号,所以+的最小值为 4. 答案:D 6.圆(x-2)2+y2=4关于直线y=x对称的圆的方程是( ) A.(x-)2+(y-1)2=4 B.(x-)2+(y-)2=4 C.x2+(y-2)2=4 D.(x-1)2+(y-)2=4 解析:设圆(x-2)2+y2=4的圆心(2,0)关于直线y=x对称的点的坐标为(a,b), 则有解得 从而所求圆的方程为(x-1)2+(y-)2=4.故选D. 答案:D 7.已知圆C的半径为,其圆心C在直线x+y+2=0上,圆C上的动点P到直线kx-y -2k+2=0(k∈R)的距离的最大值为4,则圆C的标准方程为( ) A.(x+1)2+(y+1)2=2 B.(x+2)2+y2=2 C.(x+4)2+(y-2)2=2 D.(x+3)2+(y-1)2=2 解析:∵直线kx-y-2k+2=0(k∈R), ∴k(x-2)-y+2=0,令x-2=0,-y+2=0,得x=2,y=2, ∴直线kx-y-2k+2=0(k∈R)恒过定点A(2,2), ∵圆C上的动点P到直线kx-y-2k+2=0(k∈R)的距离的最大值为4, ∴圆心C到直线kx-y—2k+2=0(k∈R)的距离的最大值为4-=3, 又圆心C在直线x+y+2=0上, ∴可设C(a,-a-2),当直线CA垂直于直线kx-y-2k+2=0(k∈R)时,圆心C到直 线kx-y-2k+2=0(k∈R)的距离最大, ∴=3,解得a=-1,故圆心C(-1,-1),∴圆C的标准方程为(x+1)2+(y+1)2=2. 答案:A 8.若一条光线从点A(-2,-3)射出,经y轴反射后与圆(x+3)2+(y-2)2=1相切,则反射光线所在直线的斜率为( ) A.-或- B.-或- C.-或- D.-或- 解析:点(-2,-3)关于y轴的对称点为(2,-3),由题意,知反射光线所在的直线一 定过点(2,-3).当反射光线所在直线的斜率不存在时,即x=2,不满足题意;设反射光 线所在直线的斜率为k,则反射光线所在直线的方程为y+3=k(x-2),即kx-y-2k-3=0. 由反射光线与圆相切,得=1,解得k=-或k=-. 答案:D 9.(2024·山西模拟)经过A(2,0),B(0,2),C(2,4)三点的圆与直线kx-y+2-4k=0的 位置关系为( ) A.相交 B.相切 C.相交或相切 D.无法确定 解析:方法一:因为k ==-1,k ==1,所以k ·k =-1,所以BA⊥BC,所以 AB BC AB BC 该圆是以AC为直径的圆,可得圆心,即(2,2),半径r==2,故圆的方程为(x-2)2+(y-2)2 =4.圆心到直线的距离d=,当k=0时,有d=0<2=r,所以圆与直线相交;当k≠0时,有 d==<2=r,所以圆与直线相交.综上可知,圆与直线的位置关系是相交,故选A. 方法二:由题知,圆过 A(2,0),B(0,2),C(2,4)三点.因为 BA=(2,-2),BC= (2,2),所以BA·BC=(2,-2)·(2,2)=0,即BA⊥BC.下同方法一. 答案:A 二、多项选择题 10.已知圆C:x2+y2+2mx-2(m+1)y+2m2+2m-3=0(m∈R)上存在两个点到点 A(0,-1)的距离为4,则m的值可能为( ) A.1 B.-1 C.-3 D.-5 解析:由题知,圆C:(x+m)2+[y-(m+1)]2=22与圆A:x2+(y+1)2=42相交.故|4- 2|<|CA|<4+2,即2<<6,解得m∈(--1,-2)∪(0,-1),∴m的值可能为-5,-3,1.故 选ACD. 答案:ACD 11.(2024·辽宁锦州模拟)关于直线l:y=kx+m与圆C:x2+y2=4,下列说法正确的是 ( ) A.若直线l与圆C相切,则m2-4k2为定值 B.若m2-k2=1,则直线l被圆C截得的弦长为定值 C.若k=m+1,则直线l与圆C相离 D.“-20恒成立,所以直线与圆相交,故C错误;直线y=kx+ m与y轴的交点是(0,m),当-20),则圆的标准方程为(x-a)2+(y-7 +2a)2=r2.又圆C经过两点A(0,5),B(3,6), 所以|CA|=|CB|=r,即=,解得a=3,所以圆心C(3,1),r=|CA|==5,所以圆C的方 程为(x-3)2+(y-1)2=25. 答案:(x-3)2+(y-1)2=25 13.(2024·湖南师大附中月考)若直线l:kx-y+2-2k=0与曲线C:y=有两个不同的 交点,则实数k的取值范围是________. 解析:由题意可得直线l:kx-y+2-2k=0即y=k(x-2)+2,所以直线l恒过定点 A(2,2),曲线C:y=为以(0,0)为圆心,2为半径的上半圆(包含与x轴相交的部分),如图所 示.当直线l过点(-2,0)时,直线l与曲线C有两个交点,此时k==;当直线l与曲线C 相切于点(0,2)时,直线l与曲线C有一个交点,此时k=0.由图象可知,若直线l与曲线C 有两个不同的交点,则04, ∴点M在圆C外部. 当过点M的直线的斜率不存在时,直线方程为x=3,即x-3=0. 又点C(1,2)到直线x-3=0的距离d=3-1=2=r, 即此时满足题意,∴直线x-3=0是圆的切线;当切线的斜率存在时,设切线方程为y-1=k(x-3),即kx-y+1-3k=0,则圆心C到切线的距离为d==r=2,解得k=. ∴切线方程为y-1=(x-3), 即3x-4y-5=0. 综上可得,过点M的圆C的切线方程为x-3=0或3x-4y-5=0. ∵|MC|==, ∴过点M的圆C的切线长为==1. 高分推荐题 15.(2024·湖南益阳模拟)已知直线l:x-y+1=0,若P为l上的动点,过点 P作 ⊙C:(x-5)2+y2=9的切线PA,PB,切点分别为A,B,当|PC|·|AB|最小时,直线AB的方 程为____________. 解析:⊙C:(x-5)2+y2=9的圆心C(5,0),半径r=3, ∵四边形PACB的面积S=·|PC|·|AB|=2S =|PA|·|AC|=3|PA|=3, △PAC ∴要使|PC|·|AB|最小,则需|PC|最小, 当 PC 与直线 l 垂直时,|PC|最小,此时直线 PC 的方程为 y=-x+5,联立解得 P(2,3),则以PC为直径的圆的方程为2+2=,则两圆方程相减可得直线AB的方程为x-y -2=0. 答案:x-y-2=0
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  1. CONNECT:[ UseTime:0.000446s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000587s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000228s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001717s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000486s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000563s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370230 LIMIT 1 [ RunTime:0.003994s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370230 [ RunTime:0.002583s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093219 WHERE `id` = 370230 [ RunTime:0.000518s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370230 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000485s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370230 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000368s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370230 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002996s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370230 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014137s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370230 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004562s ]
0.101489s