A a<1且b>1 B a>1且b>1 C a<1且a+b>1 D a>1且a+b>1

A <img width="213" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002432_1319.jpg" /> B <img width="248" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002434_1017.jpg" /> C <img width="248" height="58" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002434_2101.jpg" /> D <img width="248" height="59" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002436_1788.jpg" />

A 3x(1+x²) B -3x(1+x²) C <img width="53" height="52" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002438_2569.gif" /> D -<img width="53" height="52" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002438_2569.gif" />

A A^T与B^T相似 B A^-1与B^-1相似 C A+A^T与B+B^T相似 D A+A^-1与B+B^-1相似

A 单叶双曲面 B 双叶双曲面 C 椭球面 D 柱面

A P随μ的增加而增加 B P随σ的增加而增加 C P随μ的增加而减少 D p随σ的增加而减少

A -<img width="20" height="52" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002323_0226.gif" /> B -<img width="18" height="52" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002324_9601.gif" /> C <img width="18" height="52" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002324_9601.gif" /> D <img width="20" height="52" src="https://www.beizhujiaoyu.com/uploads/202208/20210519002323_0226.gif" />