、直线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

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、直线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
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、直线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
、直线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

、直线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
圆x2 + y2 + 4x = 0
(x+2)^2+y^2=4
圆心(-2,0)
垂直平分线与直线3x + 4y + 2 = 0垂直
斜率=4/3
y-0=4/3(x+2)
3y=4x+8
4x-3y+8=0

选择题,所以判断了圆心就可以判断这道题了,圆心是(-2,0),AB的垂直平分线肯定是过圆心的,所以我们看下选项中那个过点(-2,0)的,只有D选项
主要考的就是圆心和两交点中心的连线,垂直平方交点组成的线段