设[tex=18.143x3.643]YHIKtHtTy6YeetIBukGWJ29FyEYWVBSkIYhOTWWwEFPGYx4F+T4IU4zuU3RfAa6khi3kPAuqv6ROFOdSsPq50QkVpc+YrNyjmsoYt06z2xHh7kQe+JStYuLr+B78dhn5w7dE7MA4AOT7/cq5HBv+N8GVVlsQYR39niyEg8Ec1c2xv69ggys2rCg/7mJzQ4mC3iMA1uZl5hjPenVKQ1Tky5F43s9EXteQgRS6i+LH3XtQj/yQIjg9mPcQHmj1weIdl32PyNS4iBsHyYV7f8JvKw==[/tex].求[tex=14.143x1.571]317mMb/UfJBjZHDU7raSnidwlZvJJGDC4Q6kKERKJnoQMieKPXV/K98nsc4UmdNiwk4eO2hPrYaYvxu7m2rHsYKZ+JExFvsZ9lwJICL4Uv/+98TK7KtzVKOHt6K9if8nGeylPpkT39xWnnVcZJxcVjHYqyb7dM060Copabj1x+byO5k8QW2ZEJch3+jwnBTWU1fuzEbrr7aPsRZ7JLV5vsPsY1mbup6/Fc5+pK27GHD9LtyYJ5vlLukFdoGnZ15Jx4Q3LiE2qSaQyNGk+5BPsqfPJxqCmliCNDPCIJ28Wxt0x3waW9Qej15v+6YGEY+7[/tex].
设[tex=18.143x3.643]YHIKtHtTy6YeetIBukGWJ29FyEYWVBSkIYhOTWWwEFPGYx4F+T4IU4zuU3RfAa6khi3kPAuqv6ROFOdSsPq50QkVpc+YrNyjmsoYt06z2xHh7kQe+JStYuLr+B78dhn5w7dE7MA4AOT7/cq5HBv+N8GVVlsQYR39niyEg8Ec1c2xv69ggys2rCg/7mJzQ4mC3iMA1uZl5hjPenVKQ1Tky5F43s9EXteQgRS6i+LH3XtQj/yQIjg9mPcQHmj1weIdl32PyNS4iBsHyYV7f8JvKw==[/tex].求[tex=14.143x1.571]317mMb/UfJBjZHDU7raSnidwlZvJJGDC4Q6kKERKJnoQMieKPXV/K98nsc4UmdNiwk4eO2hPrYaYvxu7m2rHsYKZ+JExFvsZ9lwJICL4Uv/+98TK7KtzVKOHt6K9if8nGeylPpkT39xWnnVcZJxcVjHYqyb7dM060Copabj1x+byO5k8QW2ZEJch3+jwnBTWU1fuzEbrr7aPsRZ7JLV5vsPsY1mbup6/Fc5+pK27GHD9LtyYJ5vlLukFdoGnZ15Jx4Q3LiE2qSaQyNGk+5BPsqfPJxqCmliCNDPCIJ28Wxt0x3waW9Qej15v+6YGEY+7[/tex].
设[tex=18.143x3.643]YHIKtHtTy6YeetIBukGWJ29FyEYWVBSkIYhOTWWwEFPGYx4F+T4IU4zuU3RfAa6khi3kPAuqv6ROFOdSsPq50QkVpc+YrNyjmsoYt06z2xHh7kQe+JStYuLr+B78dhn5w7dE7MA4AOT7/cq5HBv+N8GVVlsQYR39niyEg8Ec1c2xv69ggys2rCg/7mJzQ4mC3iMA1uZl5hjPenVKQ1Tky5F43s9EXteQgRS6i+LH3XtQj/yQIjg9mPcQHmj1weIdl32PyNS4iBsHyYV7f8JvKw==[/tex].求[tex=14.143x1.571]317mMb/UfJBjZHDU7raSnidwlZvJJGDC4Q6kKERKJnoQMieKPXV/K98nsc4UmdNiwk4eO2hPrYaYvxu7m2rHsYKZ+JExFvsZ9lwJICL4Uv/+98TK7KtzVKOHt6K9if8nGeylPpkT39xWnnVcZJxcVjHYqyb7dM060Copabj1x+byO5k8QW2ZEJch3+jwnBTWU1fuzEbrr7aPsRZ7JLV5vsPsY1mbup6/Fc5+pK27GHD9LtyYJ5vlLukFdoGnZ15Jx4Q3LiE2qSaQyNGk+5BPsqfPJxqCmliCNDPCIJ28Wxt0x3waW9Qej15v+6YGEY+7[/tex].
设[tex=18.143x3.643]YHIKtHtTy6YeetIBukGWJ29FyEYWVBSkIYhOTWWwEFPGYx4F+T4IU4zuU3RfAa6khi3kPAuqv6ROFOdSsPq50QkVpc+YrNyjmsoYt06z2xHh7kQe+JStYuLr+B78dhn5w7dE7MA4AOT7/cq5HBv+N8GVVlsQYR39niyEg8Ec1c2xv69ggys2rCg/7mJzQ4mC3iMA1uZl5hjPenVKQ1Tky5F43s9EXteQgRS6i+LH3XtQj/yQIjg9mPcQHmj1weIdl32PyNS4iBsHyYV7f8JvKw==[/tex].求[tex=14.143x1.571]317mMb/UfJBjZHDU7raSnidwlZvJJGDC4Q6kKERKJnoQMieKPXV/K98nsc4UmdNiwk4eO2hPrYaYvxu7m2rHsYKZ+JExFvsZ9lwJICL4Uv/+98TK7KtzVKOHt6K9if8nGeylPpkT39xWnnVcZJxcVjHYqyb7dM060Copabj1x+byO5k8QW2ZEJch3+jwnBTWU1fuzEbrr7aPsRZ7JLV5vsPsY1mbup6/Fc5+pK27GHD9LtyYJ5vlLukFdoGnZ15Jx4Q3LiE2qSaQyNGk+5BPsqfPJxqCmliCNDPCIJ28Wxt0x3waW9Qej15v+6YGEY+7[/tex].
设[tex=18.143x3.643]YHIKtHtTy6YeetIBukGWJ29FyEYWVBSkIYhOTWWwEFPGYx4F+T4IU4zuU3RfAa6khi3kPAuqv6ROFOdSsPq50QkVpc+YrNyjmsoYt06z2xHh7kQe+JStYuLr+B78dhn5w7dE7MA4AOT7/cq5HBv+N8GVVlsQYR39niyEg8Ec1c2xv69ggys2rCg/7mJzQ4mC3iMA1uZl5hjPenVKQ1Tky5F43s9EXteQgRS6i+LH3XtQj/yQIjg9mPcQHmj1weIdl32PyNS4iBsHyYV7f8JvKw==[/tex].求[tex=14.143x1.571]317mMb/UfJBjZHDU7raSnidwlZvJJGDC4Q6kKERKJnoQMieKPXV/K98nsc4UmdNiwk4eO2hPrYaYvxu7m2rHsYKZ+JExFvsZ9lwJICL4Uv/+98TK7KtzVKOHt6K9if8nGeylPpkT39xWnnVcZJxcVjHYqyb7dM060Copabj1x+byO5k8QW2ZEJch3+jwnBTWU1fuzEbrr7aPsRZ7JLV5vsPsY1mbup6/Fc5+pK27GHD9LtyYJ5vlLukFdoGnZ15Jx4Q3LiE2qSaQyNGk+5BPsqfPJxqCmliCNDPCIJ28Wxt0x3waW9Qej15v+6YGEY+7[/tex].
设[tex=18.143x3.643]YHIKtHtTy6YeetIBukGWJ29FyEYWVBSkIYhOTWWwEFPGYx4F+T4IU4zuU3RfAa6khi3kPAuqv6ROFOdSsPq50QkVpc+YrNyjmsoYt06z2xHh7kQe+JStYuLr+B78dhn5w7dE7MA4AOT7/cq5HBv+N8GVVlsQYR39niyEg8Ec1c2xv69ggys2rCg/7mJzQ4mC3iMA1uZl5hjPenVKQ1Tky5F43s9EXteQgRS6i+LH3XtQj/yQIjg9mPcQHmj1weIdl32PyNS4iBsHyYV7f8JvKw==[/tex].求[tex=14.143x1.571]317mMb/UfJBjZHDU7raSnidwlZvJJGDC4Q6kKERKJnoQMieKPXV/K98nsc4UmdNiwk4eO2hPrYaYvxu7m2rHsYKZ+JExFvsZ9lwJICL4Uv/+98TK7KtzVKOHt6K9if8nGeylPpkT39xWnnVcZJxcVjHYqyb7dM060Copabj1x+byO5k8QW2ZEJch3+jwnBTWU1fuzEbrr7aPsRZ7JLV5vsPsY1mbup6/Fc5+pK27GHD9LtyYJ5vlLukFdoGnZ15Jx4Q3LiE2qSaQyNGk+5BPsqfPJxqCmliCNDPCIJ28Wxt0x3waW9Qej15v+6YGEY+7[/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))