求下列函数的傅氏变换：[tex=9.929x2.786]X7QGmJ6Ruz49ERPd5K7OU8Lp6qigHkuunDdtXoZcP8r/dWzj7Dsigu3PyIMZ7pyjGIPc3Lj2TYNhNWXEvgZ37BSTjyErYre07NBsAkmUDo0kU/0WmEepzOyhkZ4r+GQz[/tex]

[tex=4.929x1.286]YkTPuR1ypu3qAFD8IdDI4jH8rDntFXXgVrj/QQmqltk=[/tex][tex=9.929x2.786]xicKhJFEECP7baUJMXCj01NKTlcTEylzpPr9eAIVg6XU7Mw8zTsqIT2niHUV7x4zLdKvciFVP1i+foKlBSmRSVUC7W6XDtU88daccioWDHI=[/tex][tex=11.929x1.286]E0+FTlHuWRV/cPwH0ueiQyVl0JCJMYfzXDSOf+qwoAmNPV3UbJqrqQlSQuhdbkHn[/tex]

利用定积分的几何意义,说明下列等式成立:[tex=9.929x2.786]xxn7s2qupnlLhkozS264RheoGT7gFf6t6u9vg+WmEb3fRj8UBZBncRsI7vlDknjsIcwcThTDXD+zmtKWiZ3uPA==[/tex].

已知二端口的Y参数矩阵为[tex=9.929x2.786]Kp9pXzEKHnZlgzxiqNdqak3zqbeshBHsamnHG77HMo/DrOPriwpULdyY+hTqlTHwwKw2uPztFzkYQcLzK19Mb1X3G3GEp5Tu9How5GqQkRk=[/tex]求H参数矩阵 

判断下列集合对于给定运算能否构成群,并简要说明理由. [br][/br][tex=9.929x2.786]sk9PgRj6qi1ukTSOeh1uHQlOPXhTBGI1g+4eIdfFcJUF+OQxLn9ddqE8/3ZYPMpIzxBHl0blNWv4qOhiSh/PJ3unhuiNq5th80ie9w+F4aDQ2L3Fu7m19kvBDUUHERn/[/tex]为实数且[tex=4.929x1.571]PuzG5iCoMwMxpFGb7JeR3xB4aIGZcOlMB9eXm8/lz44XnbEDyU+JeDY5iJns0pbD[/tex]关于矩阵乘法.[br][/br][br][/br]

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)