到点C(3,-2)的距离等于5的轨迹方程为                ( )                                 A  (x-3

到点C(3,-2)的距离等于5的轨迹方程为                ( )                                 A  (x-3

题型:不详难度:来源:
到点C(3,-2)的距离等于5的轨迹方程为                ( )                                 
A  (x-3)2 + (y + 2)2 = 5      B  (x-3)2 + (y + 2)2 =" 25"
C  (x + 3)2 + (y-2)2 = 5      D  (x + 3)2 + (y-2)2 = 25
答案
B
解析
本题考查轨迹方程的求法。由:得:=25.
举一反三
已知圆的方程为x2 + y2-4x + 6y = 0,下列是通过圆心直线的方程为                                                   
(  )
A  3x + 2y + 1 =" 0  "         B  3x-2y + 1=" 0 "
C  3x-2y =" 0"              D  3x + 2y =" 0 "
题型:不详难度:| 查看答案
线3x + 4y + 2 = 0与圆x2 + y2 + 4x = 0交于A,B两点,则线段AB的垂直平分线的方程是                             (  )                                                                      
A  4x-3y-2 =" 0   "            B  4x-3y-6 =" 0"
C  4x + 3y + 6 =" 0  "             D  4x + 3y + 8 = 0
题型:不详难度:| 查看答案
直线3x-4y-5 = 0和(x-1)2 + (y + 3)2 = 4位置关系是  (  )                         
A 相交但不过圆心    B 相交且过圆心     C 相切     D 相离
题型:不详难度:| 查看答案
过点P(2,3)且在两坐标轴有相等截距的直线方程是    (   )                         A  x + y-5 =" 0                 " B  x + y + 5 =" 0  "
C  x + y-5 =" 0" 或x + y + 5 =" 0   " D  x + y-5 =" 0" 或3x-2y = 0
题型:不详难度:| 查看答案
两条直线2x + 3y-k = 0和x-ky + 12 = 0的交点在y轴上,那么k的值是                                    
A -24        B  6          C ±6       D  24
题型:不详难度:| 查看答案
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