逻辑表达式 (x>0 || y==5) 的相反表达式为（ ）
A. x<=0 || y!=5 B. x<=0 && y!=5 C. x>0 || y!=5 D. x>0 && y==5
一否全否
!(x>0||y==5) = (!(x>0))&&(!(y==5)) = x<=0&&y!=5
B
有个定律叫德摩根律
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!(A && B) == !A || !B
!(A || B) == !A && !B
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