|
a |
2 |
a |
2 |
A.x∉A或x∉B | B.x∉A且x∉B | C.x∈A∩B | D.x∉A或x∈B |
A.①① | B.①② | C.①③ | D.②③ |
A.(-∞,0]∪[1,+∞) | B.[0,1] | C.(-∞,0)∪(1,+∞) | D.(0,1) |
1 |
4 |
A.∃x∈R,x2-x+
| B.∀x∈R,x2-x+
| ||||
C.∀x∈R,x2-x+
| D.∃x∈R,x2-x+
|
A.∀x∈R,x≤1 | B.∃x∈R,x<1 | C.∀x∈R,x≤-1 | D.∃x∈R,x<-1 |
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