直线ι的方程为x-y-2=0,它关于点(1,-4)的对称直线方程为
A.x+y-8=0
B.x-y-8=O
C.x+y+8=0
D.x-y+8=O
直线z的方程为x-y-2=0,它关于点(1,-4)的对称直线方程为
A.x+y-8=0
B.x-y-8=0
C.z+y+8=0
D.x-y+8=0
圆X2+y2-4y=0关于直线x-y+1=0的对称圆的方程是
A.x2+y2-2x-2y-2=O
B.x2+y2-2x-2y+2=O
C.x2+y2+2x-2y-2=0
D.x2+y2-2x+2y+2=0
A.(x+1)2+y2=1
B.x2+y2=1
C.x2+(y+1)2=1
D.x2+(y-1)2=1