设 [img=122x25]18033d321cb1dab.png[/img], 且[img=58x43]18033d3224fad5b.png[/img],则下式( )成立。
A: [img=78x27]18033d322d5651c.png[/img]
B: [img=109x27]18033d323639530.png[/img]
C: [img=87x25]18033d323dd557b.png[/img]
D: [img=87x25]18033d32468bae6.png[/img]
A: [img=78x27]18033d322d5651c.png[/img]
B: [img=109x27]18033d323639530.png[/img]
C: [img=87x25]18033d323dd557b.png[/img]
D: [img=87x25]18033d32468bae6.png[/img]
举一反三
- 设 [img=122x25]18035d86bc80948.png[/img], 且[img=58x43]18035d86c5a16c0.png[/img],则下式( )成立。 A: [img=78x27]18035d86ce405bf.png[/img] B: [img=109x27]18035d86d731a1f.png[/img] C: [img=87x25]18035d86dfa8654.png[/img] D: [img=87x25]18035d86e8a2781.png[/img]
- 设 [img=122x25]18038d340451747.png[/img], 且[img=58x43]18038d340d14d0e.png[/img],则下式正确的是 . A: [img=78x27]18038d341569ff2.png[/img] B: [img=109x27]18038d341e120a2.png[/img] C: [img=87x25]18038d34272cabc.png[/img] D: [img=87x25]18038d342fa085a.png[/img]
- 设 [img=122x25]18033d321cb1dab.png[/img], 且[img=58x43]18033d3224fad5b.png[/img],则下式( )成立。 未知类型:{'options': ['', '', '', ''], 'type': 102}
- 设[img=76x21]18039b16874949f.png[/img],其中具有[img=87x25]18039b168f9d28a.png[/img]连续偏导数,则[img=16x17]18039b16980b29c.png[/img]= A: [img=41x21]18039b16a0a533c.png[/img] B: [img=52x21]18039b16a8dd787.png[/img] C: x[img=80x27]18039b16b0d0dc3.png[/img] D: [img=78x27]18039b16b8f76e1.png[/img]
- 随机变量 X 服从均匀分布[img=296x96]17de89393460b92.png[/img]则D(X)=( ). A: 4.5 B: 25/12 C: 1/5 D: 1