[tex=14.714x1.429]/ROdNvI84wx0XRkgXNROz2AgNZg+2N+1vgaLozzyq0Q2c1eIBmR+RndrjpV7n+e+vnjzWAizc9Ye4ALautNo3Q==[/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]
- 下面级数求和错误的是 A: $\sum_{n=0}^\infty q^n = \frac{1}{1-q} (0\lt q\lt1) $ B: $\sum_{n=1}^\infty \frac{x^{2^{n-1}}}{1-x^{2^n}} = \frac{x}{1-x} (|x|\lt 1) $ C: $\sum_{n=1}^\infty \frac{1}{{n!}} = e $ D: $\sum_{n=1}^\infty \frac{x^{2^{n-1}}}{1-x^{2^n}} = \frac{1}{1-x} (x>1) $
- 用符号“∈”或“∉”填空 (1)0 N; (2) 0.6 Z; (3)π R; (4)1/3 Q; (5)0 ∅
- 选择符号填空(A:"∈", B:"∉")。(1)0 N;(2) 0.6 Z;(3)π R;(4)1/3 Q;(5)0 ∅
- 已知一个序列x(n)的z变换X(z)定义成[img=140x46]17e0bb90d234a43.jpg[/img]已知某数字系统的[img=191x22]17e0bb91a52fc70.jpg[/img],则单位脉冲响应h(n)= A: h(n)={1, 2, 0, 2, 1} , 0≤n≤4 B: h(n)={1, 2, 2, 1} , 0≤n≤3 C: h(n)={1, 2, 0, 2, 1} , 1≤n≤4 D: h(n)={1, 2, 2, 1} , 1≤n≤4