已知关于x,y的二元二次方程 x2+y2+Dx+Ey+3=0.
(1)若方程表示的曲线是圆,求证:点
在圆x2+y2=12外;
(2)若方程表示的圆C的圆心在直线x+y-1=0上且在第二象限, 半径为
, 求圆C的方程.
(1)若方程表示的曲线是圆,求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e418d3c51e608b414b72c68d61c363b.png)
(2)若方程表示的圆C的圆心在直线x+y-1=0上且在第二象限, 半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
更新时间:2022-11-04 12:53:16
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