求下列函数的傅氏变换：[tex=9.857x2.786]1ctQDiaERXyAqJ5iLwT0nCOWCViIDgXUPmvysGSEZo/QDrzaSMRKwtEApPiYHW1cWqr3iOeXuIN9WVILEXaXMuVP58946Ch8IUhKXv53Fuw3P/8y9aF7p2eBkSQSdwin[/tex]

已知因果离散系统的差分方程为[tex=14.929x2.357]D8Pi71Sd+k0PY/2JWYV+iKNZwdtQWzkujJwcUIwmB/hnPBciRW4cxylhBNfZcdj3[/tex]若 [tex=9.857x2.786]JkQptay4mViCYLQts6dnyj4Q6J+go+JBpt9c5jVItaONxS+k8XQyGO88hh1EOdGg[/tex], 求系统的稳态响应

设[tex=9.857x2.786]w70lG1NUs5ZRhKHaXMaifahNYA2l55OVx/YI5vl5IU5oIet8SiRFKZulEKrEB+u3cqm8hNrtSZxKXcWgBI6y+9nBPs0rHNWiskFpGklP+ZFquYfGcw9A3GgxdMFZwNgO[/tex]则当[tex=1.357x0.786]tx3HksJQTTKWgHFrzlQSjg==[/tex][input=type:blank,size:4][/input]时，[tex=1.857x1.357]Fuvm9Mwml7lIOgc0vriwJw==[/tex]在[tex=1.857x1.0]3eSlq+W5GTl4xGu7dhqzgw==[/tex]处连续.

下列函数是偶函数的是[input=type:blank,size:4][/input]. 未知类型：{'options': ['[tex=9.286x3.643]ACpG7W/lXiEwdW69ASBj84wONCGbv23xhwGIyFqTAsumsaLLaOPLp6FpSW1UMX0Gm9K8o2gFAXE/UMAJ+wDpH3PFOHNgeXW6RZ6HOAzSmCw=[/tex]', '[tex=9.857x3.643]ACpG7W/lXiEwdW69ASBj87+7IhEyPgxjnozNiWY+F5FCVmrVGthpvvMnxaob+Qb92pGfzCtBsvaCm/l84CFPpAbVRWSXR6JPS51zzh4KLNieV5xnhsANuHgo3gX+tNap[/tex]', '[tex=9.857x2.786]ACpG7W/lXiEwdW69ASBj8+UX23UMM1v4mbi6Bqi0jQvZD0yceFCIz0aJCtdQpNGzCZuXhpycnbRah08fSfOqLpJ4+/bM+gPUFkxHgj9U0dxuFJakOSknrm/WiL9upuNN[/tex]', '[tex=10.286x3.357]ACpG7W/lXiEwdW69ASBj847RnTfW++jmgxeX7+sUfQe8mpHoVdKqKpMbpOAwtjiDWPy55ooLR3toASLM6P+ClY0A7q1Lq/u4C+yi59wzcDNKlIVoF2bvzSptVIw3Cw9H[/tex]'], 'type': 102}

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)

以下谓词公式中，( )不是逻辑有效式。 A: ($x)(P(x)∧Q(x)) Þ ($x) P(x)∧($x) Q(x) B: ("x)(P(x)∧Q(x)) Þ ("x) P(x)∧("x) Q(x) C: ($x)(P(x)∧Q(x)) Û ($x) P(x)∧($x) Q(x) D: ("x)(P(x)∧Q(x)) Û ("x) P(x)∧("x) Q(x)