There exsist matrices A and B such that AB is defined and BA is defined, but[img=79x23]1803b6ad36d9535.png[/img].
举一反三
- The chemical potential of substance B can be defined as [img=119x47]1803a1a9bb65d2b.png[/img]
- In the Rabelais and his world, Bakhtin defined carnival ad a _____.
- 设[img=121x51]1803281c887762a.png[/img][img=118x51]1803281c90e8df4.png[/img]已知AB=BA，则x = ____
- Since [img=98x47]1803e24ffc0cd5f.png[/img] is not defined at [img=44x18]1803e25004aea21.png[/img]，[img=62x33]1803e2500d5e374.png[/img] does not exist.
- 设A,B均为n阶方阵，则必有( ) A: |A+B|=|A| +|B| B: AB=BA C: |AB|=|BA| D: [img=252x59]18035a0a71c851c.png[/img]