令前提: x(F(x) G(x)), xG(x)，则下面不是其有效结论的是： A、 xF(x) B、 x G(x) C、 xF(x) D、 x(F(x) G(x)) - 查题网

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成人高等教育 / 离散数学（上）

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令前提: $forall$ x(F(x) $vee$ G(x)), $<br>eg$ $exists$ xG(x)，则下面不是其有效结论的是：

A、
$exists$ xF(x)
B、
$exists$ x $<br>eg$ G(x)
C、
$forall$ xF(x)
D、
$exists$ x(F(x) $vee$ G(x))

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离散数学（上）

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