两组电压信号满足:u1(-t)=u2(t),则u1(t)与u2(t)傅里叶系数a1n,b1n,a2n,b2n(n=0,1,2,3……)之间的关系为:
A: a1n=a2n,b1n=b2n
B: a1n=a2n,b1n=-b2n
C: a1n=-a2n,b1n=b2n
D: a1n=-a2n,b1n=-b2n
A: a1n=a2n,b1n=b2n
B: a1n=a2n,b1n=-b2n
C: a1n=-a2n,b1n=b2n
D: a1n=-a2n,b1n=-b2n
举一反三
- 中国大学MOOC: 两组电压信号满足:u1(-t)=u2(t),则u1(t)与u2(t)傅里叶系数a1n,b1n,a2n,b2n(n=0,1,2,3……)之间的关系为:
- T(n) = 2T(n/2) +n^2,T(1)=1,则 T(n) =()
- 设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]
- 二分搜索算法的时间复杂度函数,下述那个正确? A: T(n)=O(1),当n=0<br> T(n)=2T(n/2)+O(1),当n>1 B: T(n)=O(1),当n=0<br> T(n)=2T(n/2)+O(n),当n>1 C: T(n)=O(1),当n=0<br> T(n)=T(n/2)+O(1),当n>1 D: T(n)=O(1),当n=0<br> T(n)=T(n/2)+O(n),当n>1
- 中国大学MOOC: T(n) = 2T(n/2) +n^2,T(1)=1,则 T(n) =()