A.∀x∈(0,
| B.∃x0∈R,lgx0=0 | ||
C.∀x∈R,3r>0 | D.∃x0∈R,sinx0+cosx0=2 |
π |
2 |
2 |
π |
4 |
2 |
2 |
A.4 | B.3 | C.2 | D.1 |
A.∃x∈R,|x+1|<0 | B.∀x∈R,|x+1|<0 | C.∃x∈R,|x+1|≤0 | D.∀x∈R,|x+1|≤0 |
A.∃x∈R,x2+4x+5>0 | B.∃x∈R,x2+4x+5≤0 |
C.∀x∈R,x2+4x+5>0 | D.∀x∈R,x2+4x+5≤0 |
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