设A、B为n阶方阵，且满足等式AB=0，则必有( ).
A: [img=96x28]180338272d17060.png[/img]
B: [img=51x20]18033827359995a.png[/img]
C: [img=116x34]180338273e11f51.png[/img]
D: [img=74x29]180338274740f69.png[/img]
A: [img=96x28]180338272d17060.png[/img]
B: [img=51x20]18033827359995a.png[/img]
C: [img=116x34]180338273e11f51.png[/img]
D: [img=74x29]180338274740f69.png[/img]
举一反三
- 设随机变量X的概率密度为f(x)，则f(x)一定满足( ). A: 0≤f(x)≤1 B: [img=183x53]1803b451bb3373a.png[/img] C: [img=133x51]1803b451c807078.png[/img] D: f(+∞)=1
- 已知f(x)具有任意阶导数，且[img=18x32]17d622a39cdd9ca.png[/img](x)=[img=75x35]17d622a3a717d8a.png[/img]则当n为大于2的正整数时，f(x)的n阶导数[img=34x34]17d622a3b2d544c.png[/img](x)=[img=129x35]17d622a3c15d078.png[/img] ( )
- 设函数对任意x均满足f(1+x)=af(x),且[img=53x21]17e439a6f2a52f9.png[/img]b,其中a,b为非零常数,则 未知类型：{'options': ['f(x)在x=1处不可导', ' f(x)在x=1处可导,且[img=51x21]17e439a6fb4aa33.png[/img]a', ' f(x)在x=1处可导,且[img=51x21]17e439a6fb4aa33.png[/img]b', ' f(x)在x=1处可导,且[img=51x21]17e439a6fb4aa33.png[/img]ab'], 'type': 102}
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2c47707b95.png[/img] B: [img=86x65]1802f2c47feb07a.png[/img] C: [img=75x58]1802f2c4884644b.png[/img] D: [img=87x58]1802f2c48fffbbf.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2a8aba67a6.png[/img] B: [img=86x65]1802f2a8b46de33.png[/img] C: [img=75x58]1802f2a8bcdd988.png[/img] D: [img=87x58]1802f2a8c497bb0.png[/img]