在y轴上且到平面x+2y-2z-2=0距离等于4个单位的点是().
A: (0,7,0)和(0,5,0)
B: (0,-7,0)和(0,5,0)
C: (0,7,0)和(0,-5,0)
D: (0,-7,0)和(0,-5,0)
A: (0,7,0)和(0,5,0)
B: (0,-7,0)和(0,5,0)
C: (0,7,0)和(0,-5,0)
D: (0,-7,0)和(0,-5,0)
举一反三
- 在[img=57x68]17d62290ac60d65.png[/img]轴上且到平面[img=492x84]17d62290b82542a.png[/img]的距离等于4个单位的点坐标是( ) A: (0,-5,0)和(0,7,0) B: (0,5,0) C: (0,5,0)和(0,-7,0) D: (0,-7,0)
- 【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]
- 设X,Y为两个随机变量,且P{X ³0,Y ³ 0} = 3/7 , P{X ³ 0} = P{ Y ³ 0} = 4/7 ,则P{max(X, Y) ³ 0} = ( ). A: 1/7 B: 3/7 C: 4/7 D: 5/7
- 能够完成如下函数计算的程序段是____. A: y=2*x+1;if(x!=0)if(x>0)y=5*x+20;elsey=0; B: if(x>=0)if(x>0)y=5*x+20;elsey=0;elsey=2*x+1; C: y=0;if(x>=0)if(x>0)y=5*x+20;elsey=2*x+1; D: y=2*x+1;if(x>0)y=5*x+20;elsey=0;
- 描述一个正整数n能同时被3,5和7同时整除的正确表达式为 A: n//3==0 and n//5==0 and n//7==0 B: n//3==0 or n//5==0 or n//7==0 C: n%3==0 and n%5==0 and n%7==0 D: n%3==0 or n%5==0 or n%7==0