圆的方程是[img=109x22]17e438ada7d7c83.jpg[/img],则圆心和半径分别为()
A: (0,-2); 9
B: (0,2); 9
C: (0,-2); 3
D: (0, 2); 3
A: (0,-2); 9
B: (0,2); 9
C: (0,-2); 3
D: (0, 2); 3
举一反三
- 【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
- 圆[img=56x26]1802ec511a0c373.png[/img]+Dx+Ey-4=0的圆心为(-1,2),则圆的半径为() A: 6 B: 9 C: 3 D: 2
- 圆[img=56x26]1803ccf5be74189.png[/img]+Dx+Ey-4=0的圆心为(-1,2),则圆的半径为() A: 6 B: 9 C: 3 D: 2
- 圆[img=56x26]18038de8e0cd9d2.png[/img]+Dx+Ey-4=0的圆心为(-1,2),则圆的半径为() A: 6 B: 9 C: 3 D: 2
- 圆[img=56x26]1802e7afb41419d.png[/img]+Dx+Ey-4=0的圆心为(-1,2),则圆的半径为() A: 6 B: 9 C: 3 D: 2