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(x+1)2+y2=2 (x-1)2+y2=2 (x+1)2+y2=4 (x-1)2+y2=4
(x+1)2+y2=2 (x+1)2+y2=8 (x-1)2+y2=2 (x-1)2+y2=8
(x+3)2+(y-3)2=2 (x-1)2+(y+1)2=2 (x-2)2+(y+2)2=2 (x-3)2+(y+3)2=2
x-y-3=0 2x+y-3=0 x+y-1=0 2x-y-5=0
(x+1)2+y2=1 x2+y2=1 x2+(y+1)2=1 x2+(y-1)2=1
B.,则线段AB的垂直平分线方程为( ) A.x+y-1=0 2x-y+1=0 x-2y+1=0 x-y+1=0
x1=2 y1=2
x2=2 y2=1 x1=2 y1=2
x2=2 y2=2 x1=2 y1=1
x2=2 y2=2 x1=2 y1=1
x2=2 y2=1
(x-2)2+(y+1)2=1 (x-2)2+(y-1)2=1 (x-1)2+(y+2)2=1 (x+1)2+(y-2)2=1
(x-2)2+(y-1)2=4 (x-2)2+(y-1)2=20 (x-2)2+(y-1)2=12 (x-2)2+(y-1)2=4或(x-2)2+(y-1)2=20
(x+2)2+(y-2)2=1 (x-2)2+(y+2)2=1 (x+2)2+(y+2)2=1 (x-2)2+(y-2)2=1
x1=2 y1=2 x2=2 y2=1 x1=2 y1=2 x2=2 y2=2 x1=2 y1=1 x2=2 y2=2 x1=2 y1=1 x2=2 y2=1
y2-4x+4y+8=0 y2+2x-2y+2=0 y2+4x-4y+8=0 y2-2x-y-1=0
圆(x+1)2+(y+2)2=5 圆(x﹣1)2+(y﹣2)2=5 圆x2+y2﹣2x﹣4y=0的一段弧 圆x2+y2+2x+4y=0的一段弧
(x-2)2+(y+1)2=1 (x-2)2+(y-1)2=1 (x-1)2+(y+2)2=1 (x+1)2+(y-2)2=1