A.0,1) | B.(-∞,1) | C.1,+∞) | D.(-∞,1] |
|
1 |
2 |
A.∃x∈R,sinx=
| B.∀x∈R,sinx<
| ||||
C.∃x∈R,sinx≥
| D.∀x∈R,sinx≥
|
A.∃(x,y),x,y∈R,2x+3y+3<0 |
B.∃(x,y),x,y∈R,2x+3y+3≥0 |
C.∀(x,y),x∈R,y∈R,2x+3y+3≥0 |
D.∀(x,y),x∈R,y∈R,2x+3y+3>0 |
A.∀x∈R,x2-x-1>0 | ||||
B.∀α,β∈R,sin(α+β)<sinα+sinβ | ||||
C.函数y=2sin(x+
| ||||
D.∃α,β∈R,sin(α+β)=cosα+cosβ |
a2 |
A.∀a∉Q,
| B.∃a∈Q,
| C.∃a∈Q,
| D.∀a∉Q,
|
A.∃x1,x2∈R,(f(x2)-f(x1))(x2-x1)≤0 |
B.∀x1,x2∈R,(f(x2)-f(x1))(x2-x1)≤0 |
C.∃x1,x2∈R,(f(x2)-f(x1))(x2-x1)<0 |
D.∀x1,x2∈R,(f(x2)-f(x1))(x2-x1)<0 |
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