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2,(-2,1) . 4,(1,1) 2,(1,,1) ,(1,2)
y3<y2<y1 y1<y2<y3 y2<y1<y3 y2<y3<y1
, 两点,且这两点平分圆N.的圆周,则圆M.的圆心坐标为( ). A.(1,-2)B.(-1,2) (-1,-2) (1,2)
(0,1) (0,﹣1) (1,0) (﹣1,0)
(0,-1) (1,-1) (-1,0) (-1,1)
(﹣1,2),3 (﹣1,2),9 (1,﹣2),3 (1,﹣2),9
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
(0,-1) (1,-1) (-1,0) (-1,1)
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
(0,-1) (-1,0) (1,-1) (-1,1)
X5, Y2 X3, Y2 X4, Y3 X4, Y1