证明下列集合等式：[tex=12.429x1.357]eKUhmP5SV6Y50Y0NPJ5vjfwN0mXhaam2fL/OilK5a4Sb0M0HPU5tZIbyz9abYvXJ1Z51yXkofKPawZdpXqdXSaorAGSGkdDmYrZOQmDJz2s=[/tex]
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]
- 下列哪条语句是正确的（ ） A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);
- 有代码片段：function f(y) {var x=y*y;return x;} for(var x=0;x< 5;x++) {y=f(x);document.writeln(y);}输出结果是( )。 A: 0 1 2 3 4 B: 0 1 4 9 16 C: 0 1 4 9 16 25 D: 0 1 2 3 4 5
- 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;
- 执行以下语句后a的值为（ ），b的值为（ ） int a=5,b=6,w=1,x=2,y=3,z=4; (a=w>x)&&(b=y>z); A: 5 B: 0 C: 2 D: 1 E: 6 F: 0 G: 1 H: 4