设: F(x):x 能表示成分数, G(x):x 为无理数, H(x)为有理数，令前提: x(G(x) F(x)), x(H(x) F(x))，则下面不是其有效结论的是： - 查题网

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成人高等教育 / 离散数学（上）

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设: F(x):x 能表示成分数, G(x):x 为无理数, H(x)为有理数，令前提: $\forall$ x(G(x) $\mapsto$ $\neg$ F(x)), $\forall$ x(H(x) $\mapsto$ F(x))，则下面不是其有效结论的是：

A、
$\forall$ x(H(x) $\mapsto$ $\neg$ G(x))
B、
$\neg$ $\exists$ x(H(x) $\wedge$ G(x))
C、
$\exists$ x(H(x) $\mapsto$ $\neg$ G(x))
D、
$\neg$ $\forall$ x(H(x) $\mapsto$ G(x))

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离散数学（上）

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