• 2022-06-29
    求下列序列的Z变换:[img=133x44]1803dcb4a008aa4.png[/img] ()。
    A: [img=31x46]1803dcb4a8ce33d.png[/img]
    B: 1
    C: [img=40x55]1803dcb4b1da619.png[/img]
    D: [img=40x55]1803dcb4bacc188.png[/img]
  • C

    内容

    • 0

      设二维随机变量(X,Y)的概率密度为[img=356x71]1803395b6527b0d.png[/img]设Z = X + Y的概率密度[img=40x25]1803395b6dc36d8.png[/img],则[img=41x25]1803395b7554ba4.png[/img]=( ). A: 0 B: 1/8 C: 1/4 D: 3/4

    • 1

      设二维随机变量(X,Y)的概率密度为‌[img=356x71]1802f2b509f652e.png[/img]‌设Z = X + Y的概率密度[img=40x25]1802f2b5127d386.png[/img],则[img=41x25]1802f2b51a7de69.png[/img]=( ).‌ A: 0 B: 1/8 C: 1/4 D: 3/4

    • 2

      设二维随机变量(X,Y)的概率密度为[img=356x71]180390b006a79f6.png[/img]设Z = X + Y的概率密度[img=40x25]180390b00f17b02.png[/img],则[img=41x25]180390b0176f356.png[/img]=( ). A: 0 B: 1/8 C: 1/4 D: 3/4

    • 3

      设二维随机变量(X,Y)的概率密度为[img=356x71]1803a74b2e40bef.png[/img]设Z = X + Y的概率密度[img=40x25]1803a74b37ba636.png[/img],则[img=41x25]1803a74b41f9e6c.png[/img]=( ). A: 0 B: 1/8 C: 1/4 D: 3/4

    • 4

      求不定积分[img=115x46]17da65382f8e1b9.png[/img]; ( ) A: x - (5*log(x + 1))/4 - (3*log(x - 3)) B: (5*log(x + 1))/4 - (3*log(x - 3)) C: x - (5*log(x + 1))/4 - (3*log(x - 3))/4 D: (5*log(x + 1))/4 - (3*log(x - 3))/4