求[img=139x47]1802e6b098bf6fd.png[/img] ( )
A: [img=204x25]1802e6b0a1977db.png[/img]
B: [img=195x25]1802e6b0aa00157.png[/img]
C: [img=204x25]1802e6b0b2416fd.png[/img]
D: [img=210x25]1802e6b0bcacc16.png[/img]
A: [img=204x25]1802e6b0a1977db.png[/img]
B: [img=195x25]1802e6b0aa00157.png[/img]
C: [img=204x25]1802e6b0b2416fd.png[/img]
D: [img=210x25]1802e6b0bcacc16.png[/img]
举一反三
- 若X ~ N(3,[img=18x22]1803392546fb4bb.png[/img] ) ,且P{X[img=14x21]180339254fafce9.png[/img]6}=0.9 ,则P{X<0}= .
- 若X ~ N(3,[img=18x22]1803aac1fdbb23f.png[/img] ) ,且P{X[img=14x21]1803aac20626420.png[/img]6}=0.9 ,则P{X<0}= . A: 0.1 B: 0.2 C: 0.3 D: 0.4
- 已知3 阶矩阵[img=17x18]17e0bb9e6b0aa46.png[/img]的特征值为1,2,-3,求[img=93x29]17e0bb9e75d5775.png[/img]=() A: 6 B: -6 C: 25 D: -25
- 下列集合中,结果是空集的是( ) 未知类型:{'options': ['{X[img=17x17]17da574f111196a.png[/img]R|X-1=0}', ' {X|X>;6或X;6且X<;1}'], 'type': 102}
- 椭球面[img=145x26]1803d346cd9a8ca.png[/img]在点(1,1,1 )处的切平面方程是( ) A: 2x + 2y + 3z = 6 B: x + 2y + 3z = 6 C: x + 2y + z = 6 D: x + 2y + 3z = 0