A: [img=31x46]1803dcb4a8ce33d.png[/img]
B: 1
C: [img=40x55]1803dcb4b1da619.png[/img]
D: [img=40x55]1803dcb4bacc188.png[/img]
举一反三
- 求下列序列的Z变换:[img=133x44]1803aff1c935c1d.png[/img] ()。 A: [img=31x46]1803aff1d170ade.png[/img] B: 1 C: [img=40x55]1803aff1d9ab060.png[/img] D: [img=40x55]1803aff1e199a6b.png[/img]
- 求下列序列的Z变换:[img=133x44]180356760c6d4af.png[/img] ()。 A: [img=31x46]180356761492ca5.png[/img] B: 1 C: [img=40x55]180356761d0c52d.png[/img] D: [img=40x55]18035676259e98a.png[/img]
- 求下列序列的Z变换:[img=133x44]1803456200c3704.png[/img] ()。 A: [img=31x46]180345620a2a0f9.png[/img] B: 1 C: [img=40x55]180345621324310.png[/img] D: [img=40x55]180345621c8994a.png[/img]
- 求下列序列的Z变换:[img=133x44]18031724d83432a.png[/img] ()。 A: [img=31x46]18031724e0edecc.png[/img] B: 1 C: [img=40x55]18031724e8a709d.png[/img] D: [img=40x55]18031724f0ba8fb.png[/img]
- 求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8
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