若B<sub>1</sub>=X<sup>-1</sup>A<sub>1</sub>X,B<sub>2</sub>=X<sup>-1</sup>A<sub>2</sub>X,则B<sub>1</sub>B<sub>2</sub>=X<sup>-1</sup>A<sub>1</sub>A<sub>2</sub>X.<br> 若B<sub>1</sub>~A<sub>1</sub>,B<sub>2</sub>~A<sub>2</sub>,则B<sub>1</sub>B<sub>2</sub>~A<sub>1</sub>A<sub>2</sub>?<br/>A.<br>
A、A.