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2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷小题15 直线与圆_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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必刷小题 15 直线与圆 一、单项选择题 1.(2023·无锡模拟)设m∈R,直线l :(m+2)x+6y-2m-8=0,l :x+2my+m+1=0,则 1 2 “m=1”是“l∥l”的( ) 1 2 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 答案 A 解析 若l∥l,则 1 2 解得m=1或m=-3, 因此,“m=1”是“l∥l”的充分不必要条件. 1 2 2.直线ax-y-2a=0(a∈R)与圆x2+y2=9的位置关系是( ) A.相离 B.相交 C.相切 D.不确定 答案 B 解析 直线ax-y-2a=0(a∈R),即a(x-2)-y=0, 由得所以直线恒过定点(2,0), 因为22+02<9,所以定点(2,0)在圆内,所以直线与圆相交. 3.直线x+ay+b=0经过第一、二、四象限,则( ) A.a<0,b<0 B.a<0,b>0 C.a>0,b<0 D.a>0,b>0 答案 C 解析 因为直线x+ay+b=0经过第一、二、四象限, 所以该直线的斜率-<0,直线在y轴上的截距->0,可得a>0,b<0. 4.(2023·重庆模拟)已知过点P(3,1)的直线l与圆C:(x-1)2+(y-2)2=5相切,且与直线x- my-1=0垂直,则m等于( ) A.- B. C.-2 D.2 答案 C 解析 ∵(3-1)2+(1-2)2=5, ∴点P在圆C上, ∴k ==-, CP ∴切线l的斜率为2,∵l与直线x-my-1=0垂直, ∴2×=-1, 解得m=-2. 5.(2022·呼和浩特模拟)已知圆x2+2x+y2=0关于直线ax+y+1-b=0(a,b为大于0的常 数)对称,则ab的最大值为( ) A. B. C.1 D.2 答案 A 解析 因为圆x2+2x+y2=0的圆心为(-1,0),且圆x2+2x+y2=0关于直线ax+y+1-b= 0(a,b为大于0的常数)对称, 所以直线ax+y+1-b=0过圆心(-1,0), 所以a+b=1,又a>0,b>0, 所以ab≤2=,当且仅当a=b=时等号成立,即当a=b=时,ab取最大值. 6.(2023·晋城模拟)已知圆C:x2+y2=1和直线l:xx+yy=1,则“点P(x,y)在圆C上” 0 0 0 0 是“直线l与圆C相切”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 答案 C 解析 若点P在圆C上,则x+y=1,圆心到直线l:xx+yy=1的距离d==1,此时直线l 0 0 与圆C相切; 若直线l与圆C相切,则d==1,即x+y=1,此时点P在圆C上. 综上知,“点P(x,y)在圆C上”是“直线l与圆C相切”的充要条件. 0 0 7.(2022·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. 答案 A 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-. 8.在平面直角坐标系中,已知点P(3,-1)在圆C:x2+y2-2mx-2y+m2-15=0内,动直 线AB过点P且交圆C于A,B两点,若△ABC的面积的最大值为8,则实数m的取值范围 是( ) A.(3-2,3+2) B.[1,5]C.(3-2,1]∪[5,3+2) D.(-∞,1]∪[5,+∞) 答案 C 解析 圆C:x2+y2-2mx-2y+m2-15=0,即圆C:(x-m)2+(y-1)2=16, 即圆心为C(m,1),r=4, 所以△ABC的面积为S =r2sin∠ACB=8sin∠ACB≤8, △ABC 当且仅当∠ACB=,即△ABC为等腰直角三角形时等号成立,此时,|AB|=4,圆心C到直线 AB的距离为=2, 因为点P(3,-1)在圆C:x2+y2-2mx-2y+m2-15=0内, 所以2≤|PC|<4,即2≤<4, 所以8≤(m-3)2+4<16,解得3-20,得m>-7,A选项正确; 圆x2+y2=2的圆心为(0,0),半径为, 因为圆心到直线l的距离为=, 所以圆x2+y2=2上有且仅有3个点到直线l:x-y+1=0的距离等于,B选项错误; C 的圆心为(1,2),半径为3;C 的圆心为(-1,-1),半径为2, 1 2 所以圆心距为=≠3+2,C选项错误; 圆x2+y2+2x=0的圆心为A(-1,0),半径为1, 表示圆上的点B(x,y)与点C(1,0)连线的斜率, 当直线BC与圆A相切时,如图所示, AB=1,AC=2,所以∠BCA=, 结合对称性可知的取值范围是,D选项正确. 12.已知点P(x,y)是圆C:(x-1)2+y2=4上的任意一点,直线l:(1+m)x+(m-1)y+-3m =0,则下列结论正确的是( ) A.直线l与圆C的位置关系只有相交和相切两种 B.圆C的圆心到直线l距离的最大值为 C.点P到直线4x+3y+16=0距离的最小值为2 D.点P可能在圆x2+y2=1上 答案 ACD 解析 对于A选项,因为直线l的方程可化为x-y++m(x+y-3)=0. 令解得 所以直线l过定点Q(0,), 直线l是过点Q的所有直线中除去直线x+y-3=0外的所有直线, 圆心C(1,0)到直线x+y-3=0的距离为=1<2,即直线x+y-3=0与圆C相交, 又点Q(0,)在圆C:(x-1)2+y2=4上,所以直线l与C至少有一个公共点,所以直线l与圆C的位置关系只有相交和相切两种,A正确; 对于B选项,当直线l为圆C的切线时,点C到直线l的距离最大,且最大值为|QC|=2,B 错误; 对于C选项,因为圆心C到直线4x+3y+16=0的距离d==4, 所以圆C上的点P到直线4x+3y+16=0距离的最小值为4-2=2,C正确; 对于D选项,圆x2+y2=1的圆心为原点O,半径为1, 因为|OC|=1=2-1,所以圆C与圆O内切,故点P可能在圆x2+y2=1上,D正确. 三、填空题 13.若直线l :3x+y+m=0与直线l :mx-y-7=0平行,则直线l 与l 之间的距离为 1 2 1 2 ________. 答案 解析 由题设得m+3=0,即m=-3, 所以l:3x+y-3=0,l:3x+y+7=0, 1 2 所以直线l 与l 之间的距离为=. 1 2 14.过点P(2,2)的直线l 与圆(x-1)2+y2=1相切,则直线l 的方程为________________. 1 1 答案 3x-4y+2=0或x=2 解析 当过点P(2,2)的直线l 斜率不存在时,l 的方程为x=2,与圆(x-1)2+y2=1相切,满 1 1 足题意; 当过点P(2,2)的直线l 斜率存在时, 1 设l 的方程为y-2=k(x-2),即kx-y-2k+2=0, 1 ∴圆(x-1)2+y2=1的圆心到l 的距离d==1,解得k=, 1 ∴l:x-y+=0,即3x-4y+2=0, 1 综上,直线l 的方程为3x-4y+2=0或x=2. 1 15.与直线 x-y-4=0 和圆(x+1)2+(y-1)2=2 都相切的半径最小的圆的方程是 ________________. 答案 (x-1)2+(y+1)2=2 解析 圆(x+1)2+(y-1)2=2的圆心坐标为(-1,1),半径为, 过圆心(-1,1)与直线x-y-4=0垂直的直线方程为x+y=0, 则所求圆的圆心在此直线上, 又圆心(-1,1)到直线x-y-4=0的距离为=3, 则所求圆的半径为, 设所求圆的圆心为(a,b),且圆心在直线x+y=0上, 所以=,且a+b=0, 解得a=1,b=-1(a=3,b=-3不符合题意,舍去),故所求圆的方程为(x-1)2+(y+1)2=2. 16.(2023·大理模拟)设m∈R,直线l :mx-y-3m+1=0与直线l :x+my-3m-1=0相 1 2 交于点P,点Q是圆C:(x+1)2+(y+1)2=2上的一个动点,则|PQ|的最小值为________. 答案 解析 由题意得l:(x-3)m+(1-y)=0,l:(x-1)+(y-3)m=0, 1 2 ∴l 恒过定点M(3,1),l 恒过定点N(1,3),又l⊥l, 1 2 1 2 ∴P点轨迹是以|MN|为直径的圆,即以点(2,2)为圆心,以×=为半径的圆, ∴P点轨迹方程为(x-2)2+(y-2)2=2, ∵圆(x-2)2+(y-2)2=2与圆C的圆心距d==3>2, ∴两圆外离,∴|PQ|的最小值是两圆圆心距d减去两圆半径之和, 即|PQ| =3-2=. min
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  1. CONNECT:[ UseTime:0.000720s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000795s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000474s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000595s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369883 LIMIT 1 [ RunTime:0.000600s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369883 [ RunTime:0.000760s ]
  10. UPDATE `wendang` SET `lasttime` = 1773091191 WHERE `id` = 369883 [ RunTime:0.000419s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369883 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000439s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369883 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002690s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369883 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005152s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369883 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012354s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369883 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013624s ]
0.107819s