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x | 30 |
A.∃x0∉CRQ,
| B.∃x0∈CRQ,
| ||||
C.∀x0∉CRQ,
| D.∀x0∈CRQ,
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A.∃x∈R,x2-2x-3≥0 | B.∀x∈R,x2-2x-3<0 |
C.∃x∈R,x2-2x-3<0 | D.∀x∈R,x2-2x-3≤0 |
A.∀x∈(0,+∞),3x+1>0 | B.∃x∈(0,+∞),3x+1>0 |
C.∀x∉(0,+∞)3x+1≥0 | D.∃x∈(0,+∞),3x+1≥0 |
A.f(x)=lg(2x+1) | B.f(x)=x+cosx | C.f(x)=x2-
| D.f(x)=-x3-3x2 |
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