已知A是n阶方阵,AT是A的转置矩阵,
证明:A和AT有相同的特征值;
参考答案:因为|λE-AT|=|(λE-A)T|=|λE-A|,所以A和AT有相同的特征值.
Some modern teaching equipment as well as hundreds of computers ________ to ten Hope Schools in
South China . [ ]
A. were sent
B. was sent
C. have sent
D. had been sent
硅烷的分子式是()。
A.SiF4
B.SiH4
C.CH4
D.SiC