a |
b |
a |
b |
A.“p或q”是真命题 | B.“p且q”是假命题 |
C.¬p为假命题 | D.¬q为假命题 |
a |
b |
a |
b |
a |
b |
a |
b |
| ||
2 |
A.命题“p∧q”是真命题 | B.命题“p∧非q”是真命题 |
C.命题“非p∧q”是真命题 | D.命题“非p∧q”是假命题 |
A.p∧¬q | B.¬p∧¬q | C.¬p∧q | D.p∧q |
A.若p,则q | B.若p,则┐q | C.若┐q,则p | D.若┐q,则┐p |
A.①② | B.②③ | C.①②③ | D.③④ |
k |
x |
A.命题”p且q”为真 | B.命题”p或¬q”为假 |
C.命题”p或q”为假 | D.命题”¬p”且”¬q”为假 |
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