π |
4 |
π |
4 |
x+3 |
x-1 |
π |
4 |
π |
4 |
x+3 |
x-1 |
A.当a0>0时,a0-1是集合{x-1|x∈A}的最小值 |
B.当a0>0时,a0-1是集合{x-1|x∈A}的最大值 |
C.当a0<0时,-a0-1是集合{-x-1|x∈A}的最小值 |
D.当a0<0时,-a0-1是集合{-x-1|x∈A}的最大值 |
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 |
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