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A.1 | B.2 | C.3 | D.4 |
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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∈R,x2-2x=0 | B.∃x∈R,x2-2x≠0 |
C.∀x∈R,x2-2x≠0 | D.∃x∈R,x2-2x>0 |
A.∃x∈R,cos≥1 | B.∀x∈R,cos<1 |
C.∃x∈R,cosx<1 | D.∀x∈R,cosx>1 |
A.¬p:∃x0∈R,使得sinx0<-1 |
B.¬p:∀x>0,使得sinx<-1 |
C.¬p:∃x0∈R,使得sinx0>-1 |
D.¬p:∀x>0,使得sinx≥-1 |
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