• 2022-06-09
    判断下列信号的周期性,若是周期的,给出它的基波周期。[p=align:center][tex=8.786x1.429]NLkvHyYot7wzCzZybrw4gzS1UoEkhz0ARAeJ1RF9iVqA4FPQhGxZhT1GZyT/IieWtj9vaS14b64WQqERu9if5A==[/tex]
  • 解  [tex=15.571x1.429]NLkvHyYot7wzCzZybrw4g0lqVtYRx12MEeW96VfAQja5KTjVWs51js24odZaA89vANsq8dzCw5YC8FGqhXrxeCrKmlssl2HfyAe6Sgw28uH7DRr8+oXagXUzJ/PbX9ICSJUQ0etVVZrBmJ3KlBRVa8zoERZHzFjt4XgCc8XCus4=[/tex][tex=18.214x2.357]HUdtYs22Aws2cbzoisipUoAnCPRrp6wK+QIwwQBdoIq3tC2FETf4nRux95bA+XGJRrXNwkKsE+jcT+T7g4MAZtvfg9UtyD9Qgi8yvIluOJTY8dcT8BpIak6RUG2sz8F4QTK440LwMuk1S3ulXMisHlqvzHOLUEwQnLSeIo9bMgM=[/tex][tex=8.571x2.071]gUNyoVuX9vcf3TM0e4Yx7o8VQOdjQiVtCme/ZO6NzSMW/haK+3mbKsP3FiGEdHz3BUIUs4g+4xYh35yEJdOA6agIghsi2jSchFvvyWmUtNw=[/tex] , 即  [tex=3.571x2.0]ryTiG1p5ONhbNhhUAciAeFcxKeBbn2qHGiyiC2K1gPE=[/tex] , 故  [tex=2.071x1.286]Wwni5FL5C4Gtc1LIpkluPA==[/tex] 是周期序列, 基波周期 [tex=3.214x1.286]vWAu8X6pR3k0qPr5hNnyaQ==[/tex]  。

    内容

    • 0

      判定下列离散时间信号的周期性;若是周期的,确定它的基本周期。[p=align:center][tex=7.286x1.857]7hZeR2DlP8z1JG1X11gvPgzhi7uYMNw4PAN3ThUKshIq3gz5Fpbj26nzfm1Xem/n[/tex]

    • 1

      新辅助免疫治疗推荐使用多少周期 A: 1〜2周期 B: 7〜9周期 C: 4〜7周期 D: 2〜4周期

    • 2

      9判别下列函数是否是周期函数,若是周期函数,求其周期 :(1) [tex=8.357x1.357]jijpvC8Aw74QOOOJh5Va05j3PtA64Pms1Q5qDGlqeN4=[/tex](2) [tex=5.643x1.357]TG5DUF3HrCbhIJWDEcp5Pj9u3e2PUgpbN4NJQ6DZXLw=[/tex](3) [tex=5.714x1.357]SBxtvKszj8+jJcycMEKn5vqfhi5GLWqH4Gac9QRbIHc=[/tex](4) [tex=6.929x1.357]NZ5EVFRfE4pFsgkbEOhFkNg5/qZx8geAT5eL+yzbq1Q=[/tex]

    • 3

      同时掷2颗均匀骰子,X表示点数大于4出现的个数,则以下结果正确的是 A: X服从二项分布 B: P(X=0)=P(X=1) C: P(X=1)=4/9 D: P(X=0)=1/9 E: P(X=2)=4/9 F: P(X>;0)=1 G: P(X<;2)=5/9 H: P(X>;1)>;0.5

    • 4

      【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]