设[tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]阶可逆方阵[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]的伴随矩阵为[tex=1.143x1.071]F0wJ6Hm8K7uRqU9zt3sS4A==[/tex],[tex=5.714x1.5]7+UslwtIbOlbpBz5l2fvMS8pAL2LPmbb1oXRYXwsx+g=[/tex] .
举一反三
- 设[tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]阶矩阵[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]的伴随矩阵为[tex=1.143x1.071]DFelGZAPNOqMgdbfKVoEHA==[/tex],若矩阵[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]可逆,证明[tex=1.143x1.071]DFelGZAPNOqMgdbfKVoEHA==[/tex]也可逆,并求 [tex=2.857x1.571]hsYux8/o9R1M3QARVAWWJ40YE37QVAxGrOToUmC+3h4=[/tex].
- 设[tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]阶方阵[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]的伴随矩阵为[tex=1.143x1.071]F0wJ6Hm8K7uRqU9zt3sS4A==[/tex],证明:(1) 当且仅当[tex=3.143x1.357]BIh93n4rr/VbrKyEAPPe8v69B6+8CnPk9OnKv8C27gc=[/tex]时,[tex=2.643x1.357]LEFM2psKbtlE4mN5F41lug==[/tex];(2) [tex=5.357x1.5]BIh93n4rr/VbrKyEAPPe8lwNk/Hi3nckAPwcguzWmomu6um7Mzvkt1/SJRx+eUHP[/tex].
- 若 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]为[tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex] 阶方阵,[tex=1.143x1.071]LQkrj7qu81kJB+TsdvGtMw==[/tex]为 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex]的伴随矩阵,证明:[tex=12.786x4.5]uyNdoq9cJoDKbikMVGY4jW1yMSrW1BNdK/VdPCCOABZcjMDLRGVVlBO9nQ5XhIOlnDPa3If7B91qAfkFGrnsX7jBYDjogHb+BMulTtfLojcKdF93IUITPbznYf3i5bjTKPawEEunvGNLctRnD2VnEQ==[/tex]
- 设 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex] 阶方阵 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 满足 [tex=2.714x1.214]+ZPJntj7xYfllBYE3zVGBw==[/tex],证明(1)[tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 可逆;(2)[tex=9.786x1.357]06AJfdzBDu7SdZ9anbGLIPmuCvp8KJZXpIhBloDxMHk=[/tex] .
- 设 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 为 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex] 阶幂零方阵,[tex=0.786x1.0]sHo1pKm+gjxjcUAJjHrarQ==[/tex] 为 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex] 阶可逆方阵,且 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 与 [tex=0.786x1.0]sHo1pKm+gjxjcUAJjHrarQ==[/tex] 可换,则 [tex=5.071x1.214]RN2thfSI1MmKxRcibVWDuJHiSryPX2cHjTCV9twFdmY=[/tex] 都是可逆矩阵.