A.∃x∈[0,
| B.∃x∈(3,+∞),x2≤2x+1 | ||
C.∃x∈R,x2+x=-1 | D.∀x∈(0,
|
2 |
π |
4 |
2 |
π |
2 |
A.¬p:∃x∈R,cosx≤1 | B.¬p:∀x∈R,cosx≤1 |
C.¬p:∃x∈R,cosx<1 | D.¬p:∀x∈R,cosx<1 |
A.∀x∈R,aex+x>0 | B.∀x∈R,aex+x≥0 |
C.∃x∈R,aex+x≥0 | D.∃x∈R,aex+x>0 |
A.任意x∈R,x2+x-6≥0 | B.存在x∈R,x2+x-6≥0 |
C.任意x∈R,x2+x-6>0 | D.存在x∈R,x2+x-6<0 |
A.a<0 | B.a≤0 | C.a=0 | D.a≥0 |
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