问题:
经过圆 +2x+y 2=0的圆心C,且与直线x+y=0垂直的直线方程是
[ ]
A.x+y+1=0
B.x+y﹣1=0
C.x﹣y+1=0
D.x﹣y﹣1=0
经过圆 +2x+y 2=0的圆心C,且与直线x+y=0垂直的直线方程是
B.x+y﹣1=0
C.x﹣y+1=0
D.x﹣y﹣1=0
[ ]
A.x+y+1=0 B.x+y﹣1=0
C.x﹣y+1=0
D.x﹣y﹣1=0
参考答案: