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1、1/7 第 7 章第 6 节(本栏目内容，学生用书中以活页形式单独装订成册！)一、选择题(每小题 6 分，共 36分)1(2008 年重庆卷)圆 O1：x2y22x0 和圆 O2：x2y24y0 的位置关系是()A相离 B相交C外切 D内切【解读】圆 O1的圆心为A(1,0)，半径 r11，圆 O2的圆心为B(0,2)，半径 r22，所以|AB|5.又因为|r2r1|15|r1r2|3，所以两圆相交【答案】B 2直线l 与圆x2y22x4ya0(a 3)相交于A、B 两点，若弦AB 的中点为(2,3)，则直线l 的方程为()Axy50 Bxy10 Cxy5 0 Dxy30【解读】由圆的一般方程
2、可得圆心O(1,2)，由圆的性质易知O(1,2)，C(2,3)的连线与弦AB 垂直，故有kABkOC 1?kAB1 故直线AB 的方程为：y3x2 整理得：xy50.【答案】A 3若点P(a，b)在圆 C：x2 y21 的外部，则直线axby10 与圆 C 的位置关系是()A相切 B相离C相交 D相交或相切【解读】因点 P(a，b)在圆 C：x2y21 的外部，a2b21 又因圆心到直线axby10 的距离2/7 d1a2 b20，解得34k0，即 k 的取值范围为34，0.(2)设 A(x1，y1)，B(x2，y2)，则OAOB(x1 x2，y1 y2)，由方程，文档编码:CD7C9S3M4
3、Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:C
4、D7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8
5、W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX
6、6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R
7、10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 H
8、K8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9
9、S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W47/
10、7 x1 x24(k3)1k2，又 y1y2k(x1x2)4，而 P(0,2)，Q(6,0)，PQ(6，2)，所以 OAOB与PQ共线等价于2(x1x2)6(y1y2)，将 代入上式，解得k34，由(1)知 k?34，0，故没有符合题意的常数k.文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文
11、档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A1
12、0K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P
13、10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A
14、7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M
15、4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:
16、CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4文档编码:CD7C9S3M4Q8 HK8A7U10R10P10 ZX6A10K4U8W4
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