题目
A.前提:("x)(~P(x)ÞQ(x)), ("x)~Q(x) 结论:P(a)
B.前提:("x)(P(x)ÞQ) 结论:("x)P(x)ÞQ
C.前提:("x)(P(x)∨Q(x)), ("x)(Q(x)Þ~R(x)) 结论:($x)(R(x)ÞP(x))
D.前提:("x)(P(x)Þ(Q(x)∧R(x))), ($x)(P(x)∧S(x)) 结论:("x)(R(x)∧S(x))
E.前提:("x)($y)P(x, y) 结论:("x)($y)($z)(P(x, y)∧P(y, z))
F.前提:("x)P(x)∨("x)Q(x) 结论:("x)(P(x)∨Q(x))
G.前提:("x)(G(x)ÞH(x)),~($x)(F(x)∧H(x)) 结论:($x)F(x)Þ($x)G(x)
H.前提:("x)(H(x)ÞM(x)) 结论:("x)("y)(H(y)∧N(x, y
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