2020 National Question 8 Single-choice Differentiating 2020_新课标II Paper 8.若过点(2,1)的圆与两坐标轴都相切,则圆心到直线 $2 x - y - 3 = 0$ 的距离为( ) A. $\frac { \sqrt { 5 } } { 5 }$B. $\frac { 2 { \sqrt { 5 } } } { 5 }$C. $\frac { 3 { \sqrt { 5 } } } { 5 }$D. $\frac { 4 { \sqrt { 5 } } } { 5 }$ Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →