A.p真q假 | B.p假q真 | C.“p或q”为假 | D.“p且q”为真 |
|
1 |
a |
1 |
a |
1 |
a |
|
A.(¬p)∨q | B.p∧q | C.(¬p)∧(¬q) | D.(¬p)∨(¬q) |
π |
4 |
1 |
sinx |
A.∀x∈R,若x≤1,则x≤0 | B.∃x∈R,若x≤1,则x≤0 |
C.∀x∈R,若x>1,则x≤0 | D.∃x∈R,若x>1,则x≤0 |
A.若p,则¬q或¬r | B.若p,则¬q且¬r |
C.若¬p,则¬q或¬r | D.若¬p,则¬q且¬r |
4 |
A.p是假命题 | B.p∧q是真命题 |
C.¬p是真命题 | D.p∨q是真命题 |
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