Two questions about matrices are discussed.One is answered, the other is answered in case its rank=1,2,3,4,5 resp.. The results obtained in this paper can be extended in many occasions.
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冯良贵.两个有关矩阵问题的回答[J].国防科技大学学报,2001,23(1):77-80. FENG Lianggui. The Answers of Two Questions on Matrices[J]. Journal of National University of Defense Technology,2001,23(1):77-80.