设[tex=19.571x2.786]uaGqE0RpAfI8W2VlBZuEjayc14kpPdPrvWgsY0BTd+GJBBgbWsz6CyBEQ+8LQGpkxYm9L5R6xBEVNd74+q0cCw/uuIOstDF0l800oAGD9rHWCWyvxGyz/wLUGb0VJep6[/tex],计算[tex=18.786x1.357]hBVuIITHXMhxaBlfIRXJy9+mdbDMJztbON19TVz4snC/tdJn9iKxJXmvN03hpGWl02zFD/sAq6pctmmyJvUl4A==[/tex]
设[tex=19.571x2.786]uaGqE0RpAfI8W2VlBZuEjayc14kpPdPrvWgsY0BTd+GJBBgbWsz6CyBEQ+8LQGpkxYm9L5R6xBEVNd74+q0cCw/uuIOstDF0l800oAGD9rHWCWyvxGyz/wLUGb0VJep6[/tex],计算[tex=18.786x1.357]hBVuIITHXMhxaBlfIRXJy9+mdbDMJztbON19TVz4snC/tdJn9iKxJXmvN03hpGWl02zFD/sAq6pctmmyJvUl4A==[/tex]
【2005】设[tex=1.857x1.357]Fuvm9Mwml7lIOgc0vriwJw==[/tex],[tex=1.857x1.357]onZXu4LK1qWqnNzYw8C+9Q==[/tex]在[0,1]上的导数连续,且[tex=1.786x1.357]0A8YwkCQwNdYUwKQhxslrw==[/tex][tex=6.071x1.429]mHEtlbnjrw21yEvxAiXcOmZyrpxaoqOpBzFArAXSNfjj+hP5z6EEbeHwpfoJyGUG[/tex],[tex=3.929x1.429]09K1HqLRD2fPPoiIPjCVOJuhWbBCFrqrJZxveZCsjJY=[/tex],证明:对任何[tex=3.786x1.357]NI+8sqyNc+Ah4b9tyD8vcmfBnJ0sdCqm1Nl6egONBNM=[/tex],有[tex=19.571x2.786]FuSYK+3iwG0ewS7wuivcZjrw3IdHulqxwlCuQS64ur7ukFKVVMdHAX1lV/87UDFbmgjpa3/8eJV1ZQtBtLxWyfoB8uPpRTdB+65AazhpONK7YTjfLO6FA2Mm1jY0SJgICBfGg5gkQiv9kMDorcUacg==[/tex].
【2005】设[tex=1.857x1.357]Fuvm9Mwml7lIOgc0vriwJw==[/tex],[tex=1.857x1.357]onZXu4LK1qWqnNzYw8C+9Q==[/tex]在[0,1]上的导数连续,且[tex=1.786x1.357]0A8YwkCQwNdYUwKQhxslrw==[/tex][tex=6.071x1.429]mHEtlbnjrw21yEvxAiXcOmZyrpxaoqOpBzFArAXSNfjj+hP5z6EEbeHwpfoJyGUG[/tex],[tex=3.929x1.429]09K1HqLRD2fPPoiIPjCVOJuhWbBCFrqrJZxveZCsjJY=[/tex],证明:对任何[tex=3.786x1.357]NI+8sqyNc+Ah4b9tyD8vcmfBnJ0sdCqm1Nl6egONBNM=[/tex],有[tex=19.571x2.786]FuSYK+3iwG0ewS7wuivcZjrw3IdHulqxwlCuQS64ur7ukFKVVMdHAX1lV/87UDFbmgjpa3/8eJV1ZQtBtLxWyfoB8uPpRTdB+65AazhpONK7YTjfLO6FA2Mm1jY0SJgICBfGg5gkQiv9kMDorcUacg==[/tex].
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}
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)
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( $x)B(x)
下列式中错误的是: A: (∀x)(A(x)Úp(x)) Û (∀x)A(x)Ú (∀x)p(x) B: ($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( $x)B(x)
判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(¬A(x)∨B(x)) ⇔(∀x)¬( A(x)∧¬B(x) ) ⇔¬(∃x) ( A(x)∧¬B(x) ) ⇔¬( (∃x)A(x)∧(∃x)¬B(x) ) ⇔¬(∃x)A(x)∨¬(∃x)¬B(x) ⇔¬(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)
判断下列推证是否正确。 (∀x)(A(x)→B(x))⇔(∀x)(¬A(x)∨B(x)) ⇔(∀x)¬( A(x)∧¬B(x) ) ⇔¬(∃x) ( A(x)∧¬B(x) ) ⇔¬( (∃x)A(x)∧(∃x)¬B(x) ) ⇔¬(∃x)A(x)∨¬(∃x)¬B(x) ⇔¬(∃x)A(x)∨(∀x)B(x) ⇔(∃x)A(x)→(∀x)B(x)
以下谓词公式中,( )不是逻辑有效式。 A: ($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)∧($x) Q(x) D: ("x)(P(x)∧Q(x)) Û ("x) P(x)∧("x) Q(x)
以下谓词公式中,( )不是逻辑有效式。 A: ($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)∧($x) Q(x) D: ("x)(P(x)∧Q(x)) Û ("x) P(x)∧("x) Q(x)
以下谓词公式中,( )不是逻辑有效式。 A: ($x) P(x)∨($x) Q(x) Þ ($x)(P(x)∨Q(x)) B: ("x) P(x)∨("x) Q(x) Þ ("x)(P(x)∨Q(x)) C: ($x) P(x)∨($x) Q(x) Û ($x)(P(x)∨Q(x)) D: ("x) P(x)∨("x) Q(x) Û ("x)(P(x)∨Q(x))
以下谓词公式中,( )不是逻辑有效式。 A: ($x) P(x)∨($x) Q(x) Þ ($x)(P(x)∨Q(x)) B: ("x) P(x)∨("x) Q(x) Þ ("x)(P(x)∨Q(x)) C: ($x) P(x)∨($x) Q(x) Û ($x)(P(x)∨Q(x)) D: ("x) P(x)∨("x) Q(x) Û ("x)(P(x)∨Q(x))
使用下述谓词:P(x): x是语言、Q(x): x是中间语言、R(x): x是世界通用的,及量词表示自然语句“没有语言是世界通用的话,就至少有一种中间语言存在”为( )。A.~($x)(P(x) Þ R(x)) Þ ($x) Q(x)B.~($x)(P(x)∧R(x)) ∧ ($x) Q(x) C.~($x)(P(x) Þ R(x)) ∧ ($x) Q(x) D.~($x)(P(x)∧R(x)) Þ ($x) Q(x) A: ~($x)(P(x) Þ R(x)) Þ ($x) Q(x) B: ~($x)(P(x)∧R(x)) ∧ ($x) Q(x) ~($x)(P(x) Þ R(x)) ∧ ($x) Q(x) D.~($x)(P(x)∧R(x)) Þ ($x) Q(x) C: ~($x)(P(x) Þ R(x)) ∧ ($x) Q(x) D: ~($x)(P(x)∧R(x)) Þ ($x) Q(x)
使用下述谓词:P(x): x是语言、Q(x): x是中间语言、R(x): x是世界通用的,及量词表示自然语句“没有语言是世界通用的话,就至少有一种中间语言存在”为( )。A.~($x)(P(x) Þ R(x)) Þ ($x) Q(x)B.~($x)(P(x)∧R(x)) ∧ ($x) Q(x) C.~($x)(P(x) Þ R(x)) ∧ ($x) Q(x) D.~($x)(P(x)∧R(x)) Þ ($x) Q(x) A: ~($x)(P(x) Þ R(x)) Þ ($x) Q(x) B: ~($x)(P(x)∧R(x)) ∧ ($x) Q(x) ~($x)(P(x) Þ R(x)) ∧ ($x) Q(x) D.~($x)(P(x)∧R(x)) Þ ($x) Q(x) C: ~($x)(P(x) Þ R(x)) ∧ ($x) Q(x) D: ~($x)(P(x)∧R(x)) Þ ($x) Q(x)