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x+y-1=0 x+y+3=0 x-y+1=0 x-y+3=0
(x+1)2+(y+4)2=4 (x﹣1)2+(y﹣4)2=4 (x﹣4)2+(y﹣1)2=4 (x+4)2+(y+1)2=4
的坐标是(1,2),则直线PQ的方程是( ) A.x+2y-3=0 x+2y-5=0 2x-y+4=0 2x-y=0
3x-y-5=0 3x+y-7=0 3x-y-1=0 3x+y-5=0
(1,2),则直线PQ的方程是( ) A.x+2y-3=0 x+2y-5=0 2x-y+4=0 2x-y=0
x+3y-4=0 x+3y-10=0 3x-y+4=0 3x-y=0
2x-y=0 2x-y-2=0 x+2y-3=0 x-2y+3=0
2x–y=0 2x–y–2=0 x+2y–3=0 x+2y–5=0
x-y+1=0 x+y-1=0 x-y-1=0 x+y+1=0
x2+y2-4x=0 x2+y2+4x=0 x2+y2-2x-3=0 x2+y2+2x-3=0
y2-4x+4y+8=0 y2+2x-2y+2=0 y2+4x-4y+8=0 y2-2x-y-1=0
, ,则过A.B.及原点O.三点的圆的方程是( ) A.x2+y2+4x﹣3y=0B.x2+y2﹣4x﹣3y=0 x2+y2+4x﹣3y﹣4=0 x2+y2﹣4x﹣3y+8=0
x+y-3=0 x-y-3=0 x+4y-3=0 x-4y-3=0
x+y-5=0 x+y-3=0 x-y-1=0 x-y+1=0