已知稳定系统的所有极点[img=92x22]18034afb2385b02.png[/img]，则系统函数的ROC是（ ）
A: [img=66x25]18034afb2d95520.png[/img]
B: [img=113x25]18034afb35fb4f4.png[/img]
C: [img=99x25]18034afb3e46098.png[/img]
D: [img=52x25]18034afb473b9ce.png[/img]
A: [img=66x25]18034afb2d95520.png[/img]
B: [img=113x25]18034afb35fb4f4.png[/img]
C: [img=99x25]18034afb3e46098.png[/img]
D: [img=52x25]18034afb473b9ce.png[/img]
举一反三
- 求不定积分[img=121x54]17da653839aa6ae.png[/img]； （ ） A: log(x^2 + 3*x + 25/4)/4 + (5*atan(x/2 + 3/4))/4 B: log(x^2 + 3*x + 25/4)/4 C: (5*atan(x/2 + 3/4))/4 D: log(x^2 + 3*x + 25/4)/4 - (5*atan(x/2 + 3/4))/4
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ，则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- 已知稳定系统的所有极点[img=92x22]18034afb2385b02.png[/img]，则系统函数的ROC是（ ） 未知类型：{'options': ['', '', '', ''], 'type': 102}
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and [img=60x23]1803a1c503ffa04.png[/img]} ? ( ) A: [img=113x25]1803a1c50cc3162.png[/img] B: [img=139x25]1803a1c514e60ea.png[/img] C: [img=51x22]1803a1c51dd52ef.png[/img] D: {x|x is an integer and |x| <4} [img=33x22]1803a1c525cf1bd.png[/img]