• 2022-06-06
    已知圆心是(2,-1),半径为2的圆的方程是( )
    A: [img=178x27]1802db2dd22be52.png[/img]
    B: [img=178x27]1802db2ddaf027f.png[/img]
    C: [img=178x27]1802db2de2b0b15.png[/img]
    D: [img=178x27]1802db2dead82d5.png[/img]