A ab=<img src="https://www.beizhujiaoyu.com/uploads/202208/162088920649841.png" alt="" width="12" height="32" title="" align="" /> B ab=-<img src="https://www.beizhujiaoyu.com/uploads/202208/162089030188311.png" alt="" width="12" height="32" title="" align="" /> C ab=0 D ab=2

A f(1)>f(-1) B f(1)<f(-1) C |f(1)|>|f(-1)| D |f(1)|<|f(-1)|

A 12 B 6 C 4 D 2

A t₀=10 B 15<t₀<20 C t₀=25 D t₀>25

A E-αα^T不可逆 B E+αα^T不可逆 C E+2αα^T不可逆 D E-2αα^T不可逆

A A与C相似，B与C相似 B A与C相似，B与C不相似 C A与C不相似，B与C相似 D A与C不相似，B与C不相似

A P(B|A)>P(B|<img src="https://www.beizhujiaoyu.com/uploads/202208/162089162565931.png" alt="" width="12" height="21" title="" align="" />) B P(B|A)<P(B|<img src="https://www.beizhujiaoyu.com/uploads/202208/162089171923311.png" alt="" width="12" height="21" title="" align="" />) C P(<img src="https://www.beizhujiaoyu.com/uploads/202208/16208917577551.png" alt="" width="12" height="21" title="" align="" />|A)>P(B|<img src="https://www.beizhujiaoyu.com/uploads/202208/162089178729961.png" alt="" width="12" height="21" title="" align="" />) D P(<img src="https://www.beizhujiaoyu.com/uploads/202208/162089183237521.png" alt="" width="12" height="21" title="" align="" />|A)<P(B|<img src="https://www.beizhujiaoyu.com/uploads/202208/162089186095181.png" alt="" width="12" height="21" title="" align="" />)

A <img src="https://www.beizhujiaoyu.com/uploads/202208/162089201141981.png" alt="" width="200" height="40" title="" align="" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/162089203318651.png" alt="" width="200" height="21" title="" align="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/162089205254661.png" alt="" width="200" height="40" title="" align="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/162089207776841.png" alt="" width="200" height="25" title="" align="" />