A.∀x∈R,x2+3<0 | B.∀x∈N,x2≥1 |
C.∃x∈Z,使x5<1 | D.∃x∈Q,x2=3 |
3 |
x | 20 |
A.0 | B.1 | C.2 | D.3 |
A.0 | B.1 | C.2 | D.3 |
1 |
2 |
A.④ | B.③④ | C.①②④ | D.①③④ |
A.q⇒p | B.¬p⇒¬q | C.¬q⇒¬p | D.¬q⇒p |
a |
b |
a |
b |
2π |
3 |
a |
b |
2π |
3 |
a |
b |
π |
3 |
a |
b |
π |
3 |
A.p2,p3 | B.p1,p3 | C.p1,p4 | D.p3,p4 |
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