k为何值时，[tex=7.429x3.929]Uyz5s0rmQIddjb5Jc2T/YTpBoRm8xUYtAqE7zEpoOJP4k8mKUrvyGR6A3h+spGzME/PwE6KN5aUCGnwQdSxmqQ2JENY9S5kMbpxvHY+IbymO+vH8+4xrdLN0OAHqpAuh[/tex].

k为何值时，[tex=7.429x3.929]Uyz5s0rmQIddjb5Jc2T/YTpBoRm8xUYtAqE7zEpoOJP4k8mKUrvyGR6A3h+spGzME/PwE6KN5aUCGnwQdSxmqQ2JENY9S5kMbpxvHY+IbymO+vH8+4xrdLN0OAHqpAuh[/tex].

用对角线法则求下列 3 阶行列式:[tex=7.429x3.929]TIwZYBkNsy31H1RNd/OloCzBksPx+fO2Romdq9gQsDADCg03zv5D59q8bCDZjdefDEjDaosn8N8ULRW45CO5KBQTdblp9u4oA5tJI8cyquQ667aHiAhUI8ZUd8k8Vek0[/tex]

当[tex=0.571x1.0]CQkpoDeAAI+5FKIfe1wVCA==[/tex]取何值时，[tex=7.429x3.929]Uyz5s0rmQIddjb5Jc2T/YTpBoRm8xUYtAqE7zEpoOJP4k8mKUrvyGR6A3h+spGzME/PwE6KN5aUCGnwQdSxmqQ2JENY9S5kMbpxvHY+IbymO+vH8+4xrdLN0OAHqpAuh[/tex]

求方阵[tex=7.429x3.929]dEdrC9SQsN/3Vx39SaFo4Oq6pHORwUgHH4K6K4NRwvYfQZG3o8fHphhOcVcvU62bhMWb+VDLGtHLuvCrcX7E8KY9LBstmQkMv08rZhiVO0z10tL9/ntCNXIP11iT58tn[/tex]的实特征值与对应的特征向量．

下列变量组（）是一个闭回路。 A: {x，x，x，x，x，x} B: {x，x，x，x，x} C: {x，x，x，x，x，x} D: {x，x，x，x，x，x}

以下谓词蕴含式正确的是（）: (∀x) (A(x)→B(x))=>( ∀x)A(x)→(∀x)B(x)|(∀x) (A(x)↔B(x))=>( ∀x)A(x)↔(∀x)B(x)|(∀x)A(x)∨(∀x)B(x)=>( ∀x) (A(x)∨B(x))|(∃x) (A(x)∧B(x))=>(∃x)A(x)∧(∃x)B(x)

以下谓词蕴含式正确的是（）: (?x) (A(x)→B(x))=>( ?x)A(x)→(?x)B(x)|(?x) (A(x)?B(x))=>( ?x)A(x)?(?x)B(x)|(?x)A(x)∨(?x)B(x)=>( ?x) (A(x)∨B(x))|(?x) (A(x)∧B(x))=>(?x)A(x)∧(?x)B(x)

下列式中错误的是： A: (∀x)(A(x)Úp(x)) Û (∀x)A(x)Ú (∀x)p(x) B: ($x)A(x) Ù p Û ($x)(A(x) Ù p ) C: (∀x)(A(x)ÚB(x)) Þ (∀x)A(x)Ú( ∀x)B(x) D: ($x)(A(x)ÙB(x)) Þ ($x)A(x)Ù( $x)B(x)

判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(￢A(x)∨B(x)) ⇔(∀x)￢( A(x)∧￢B(x) ) ⇔￢(∃x) ( A(x)∧￢B(x) ) ⇔￢( (∃x)A(x)∧(∃x)￢B(x) ) ⇔￢(∃x)A(x)∨￢(∃x)￢B(x) ⇔￢(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)