• 2022-07-26
    已知圆心是(2,-1),半径为2的圆的方程是( )
    A: [img=178x27]1802ec5073c2d53.png[/img]
    B: [img=178x27]1802ec507be6a13.png[/img]
    C: [img=178x27]1802ec50851f5c3.png[/img]
    D: [img=178x27]1802ec508d8bb5b.png[/img]