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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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题(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(五十) 圆与圆的位置关系及圆的综合问题 一、单项选择题 1.圆C :(x+1)2+(y-2)2=4与圆C :(x-3)2+(y-2)2=4的公切线的条数是( ) 1 2 A.1 B.2 C.3 D.4 2.(2024·安徽阜阳月考)圆x2+y2-mx+y+m=0在x轴上截得的弦长是它在y轴上截 得的弦长的2倍,则实数m的值是( ) A.-6-2 B.-6+2 C.-3- D.-3+ 3.若圆C:x2+(y-4)2=18与圆D:(x-1)2+(y-1)2=R2的公共弦长为6,则圆D的 半径为( ) A.5 B.2 C.2 D.2 4.(2024·北京朝阳区模拟)已知过定点P(2,0)的直线l与曲线y=相交于A,B两点,O 为坐标原点,当△AOB的面积最大时,直线l的倾斜角为( ) A.150° B.135° C.120° D.30° 5.已知点P(6,0),点A(1,1),动点C满足OC·PC=0(O为坐标原点),过点A的直线被 动点C的轨迹曲线截得的所有弦中最短弦所在的直线方程为( ) A.y=2x-1 B.y=-2x+1 C.y=x-1 D.y=-x+1 6.(2024·甘肃兰州模拟)阿波罗尼斯是古希腊著名数学家,与阿基米德、欧几里得并称 为亚历山大时期数学三巨匠.他研究发现:如果一个动点P到两个定点的距离之比为常数 λ(λ>0,且λ≠1),那么点P的轨迹为圆,这就是著名的阿波罗尼斯圆.若点 C到点A(- 1,0),B(1,0)的距离之比为,则点C到直线x-2y+8=0的距离的最小值为( ) A.2- B.- C.2 D. 7.(2024·陕西第一次大联考)已知圆C:x2+y2-4x+8y=0关于直线3x-2ay-22=0 对称,则圆C中以为中点的弦长为( ) A.2 B. C. D.2 8.已知圆C :x2+y2-kx-y=0和圆C :x2+y2-2ky-1=0的公共弦所在的直线恒过 1 2 定点M,且点M在直线mx+ny=2上,则的最小值为( ) A. B. C. D. 9.(2024·江苏南通期末)已知圆心均在x轴上的两圆外切,半径分别为r,r(r0,且λ≠1),那么点P的轨迹为圆,这就是著名的阿波罗尼斯圆.若点 C到点A(- 1,0),B(1,0)的距离之比为,则点C到直线x-2y+8=0的距离的最小值为( ) A.2- B.- C.2 D. 解析:设C(x,y),则=,即=,化简得(x-2)2+y2=3,所以点C的轨迹是以(2,0)为圆 心,r=的圆,则圆心到直线x-2y+8=0的距离d==2,所以点C到直线x-2y+8=0的 距离的最小值为2-. 答案:A 7.(2024·陕西第一次大联考)已知圆C:x2+y2-4x+8y=0关于直线3x-2ay-22=0 对称,则圆C中以为中点的弦长为( ) A.2 B. C. D.2 解析:圆C的方程可化为(x-2)2+(y+4)2=20,圆心C(2,-4),r=2,∵圆C关于直 线3x-2ay-22=0对称,∴直线过圆心C(2,-4),即3×2+8a-22=0,解得a=2.圆心C 与点(1,-1)的距离的平方为10,则圆C中以(1,-1)为中点的弦长为2=2,故选D. 答案:D 8.已知圆C :x2+y2-kx-y=0和圆C :x2+y2-2ky-1=0的公共弦所在的直线恒过 1 2 定点M,且点M在直线mx+ny=2上,则的最小值为( ) A. B. C. D. 解析:由圆C :x2+y2-kx-y=0和圆C :x2+y2-2ky-1=0,可得两圆的公共弦所 1 2 在的直线方程为k(x-2y)+(y-1)=0,令解得即点M(2,1),又点M在直线mx+ny=2上, 所以2m+n=2.因为原点(0,0)到直线2x+y=2的距离d==,所以的最小值为.故选C. 答案:C 9.(2024·江苏南通期末)已知圆心均在x轴上的两圆外切,半径分别为r,r(r0,r>0,-32+,两圆相离,故B正确;由两 1 2 圆有公共弦,两圆的方程相减可得公共弦所在直线方程为4x+(6-2m)y+m2-2=0,故C 错误;直线kx-y-2k+1=0过定点(2,1),而(2-1)2+(1-3)2=5<11,故点(2,1)在圆C :(x 1 -1)2+(y-3)2=11内部,所以直线kx-y-2k+1=0与圆C 始终有两个交点,故D正确. 1 答案:BD 三、填空题与解答题 12.若A为圆C :x2+y2=1上的动点,B为圆C :(x-3)2+(y+4)2=4上的动点,则 1 2 线段AB长度的最大值是________. 解析:圆C :x2+y2=1的圆心为C (0,0),半径r =1,圆C :(x-3)2+(y+4)2=4的圆 1 1 1 2 心为C (3,-4),半径r =2,∴|C C |=5.又A为圆C 上的动点,B为圆C 上的动点,∴ 2 2 1 2 1 2 线段AB长度的最大值是|C C |+r+r=5+1+2=8. 1 2 1 2 答案:8 13.(2024·山西临汾模拟)已知点A(-2,0),B(2,0),动点M满足|MA|=|MB|,则直线y =2x-2被动点M的轨迹截得的弦长为________. 解析:设点M(x,y),依题意,=·,整理得(x-3)2+y2=5,因此,点M的轨迹是以 C(3,0)为圆心,r=为半径的圆.点C到直线2x-y-2=0的距离d==,所以直线y=2x- 2被动点M的轨迹截得的弦长为2=2=. 答案: 14.已知圆C:(x-3)2+(y-4)2=4. (1)若直线l:(m-2)x+(1-m)y+m+1=0(m∈R),证明:无论m为何值,直线l都与 圆C相交; (2)若过点P(1,0)的直线l′与圆C相交于A,B两点,求△ABC面积的最大值,并求此时 直线l′的方程. (1)证明:转化l的方程(m-2)x+(1-m)·y+m+1=0,可得m(x-y+1)-2x+y+1=0, 由解得 所以直线l恒过点(2,3), 由(2-3)2+(3-4)2=2<4, 得点(2,3)在圆内, 即直线l恒过圆内一点, 所以无论m为何值,直线l都与圆C相交. (2)解:由C的圆心为(3,4),半径r=2, 易知此时直线l′的斜率存在且不为0, 故设直线l′的方程为x=my+1(m≠0), 直线l′的一般方程为my-x+1=0, 圆心到直线l′的距离d==, 所以|AB|=2=2, 所以S2=2=·, 令t=,可得S2=4t-t2, 当t=2时,S=4, 所以△ABC面积的最大值为2. 此时由2=, 得7m2-8m+1=0, 得m=1或m=,符合题意, 此时直线l′的方程为x-y-1=0或7x-y-7=0. 高分推荐题 15.(2024·河北衡水中学阶段练习)如图为世界名画《蒙娜丽莎》.假设蒙娜丽莎微笑 时的嘴唇可看作半径为1的圆O的一段圆弧E,且弧E所对的圆周角为.设圆C的圆心C在 点O与弧E中点的连线所在直线上.若存在圆C满足弧E上存在四点过这四点作圆O的切 线,这四条切线与圆C也相切,则弧E上的点与圆C上的点的最短距离的取值范围为( ) A.(0,-1] B.(0,] C.(0,-1) D.(0,) 解析:如图,设弧E的中点为M,弧E所对的圆周角为,则弧E所对的圆心角为,圆 O的半径|OM|=1,在弧E上取两点A,B,则∠AOB≤.分别过点A,B作圆O的切线,并交 直线OM于点D.当过点A,B的切线刚好是圆O与圆C的外公切线时,劣弧AB上一定还存 在点S,T,使过点S,T的切线为两圆的内公切线,则圆C的圆心C只能在线段MD上,且不包括端点.过点C,分别向AD,BD作垂线,垂足为R,P,则CR即为圆C的半径. 设线段OC交圆C于点N,则弧E上的点与圆C上的点的最短距离即为线段MN的长度. 在Rt△AOD中,|OD|==≤==+1,则|MN|=|OC|-|OM|-|CN|=|OC|-1-|CR|<|OD|-1 -0≤+1-1=,即弧E上的点与圆C上的点的最短距离的取值范围为(0,).故选D. 答案:D
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  1. CONNECT:[ UseTime:0.000616s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000887s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000445s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000552s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370207 LIMIT 1 [ RunTime:0.001877s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370207 [ RunTime:0.001062s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093118 WHERE `id` = 370207 [ RunTime:0.000586s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370207 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000498s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370207 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000533s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370207 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011173s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370207 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010477s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370207 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006343s ]
0.101579s