10.
A. Send written work to a tutor.
B. Spend 3 weeks as a full-time student.
C. Receive advice at a study center.
D. Take part in the final examinations.
若A1,…,An都可逆，则A1…An也可逆,且（A1…An）-1＝（An）-1…（A1）-1．( )
A. 对
B. 错
设A、B为同阶方阵，且AB=BA，则矩阵方程AX=B和XA=B有相同的解．( )
A. 对
B. 错
设A、B为同阶方阵,且AB=BA,A可逆，则矩阵方程AX=B和XA= B有相同的惟一解．( )
A. 对
B. 错
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