1 |
4 |
1 |
4 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
4 |
1 |
4 |
a | 2n |
1 |
2 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
2-a | ||
a-
|
1 |
4 |
A.1 | B.2 | C.3 | D.4 |
n |
n+1 |
1 |
n |
x-a |
x+a |
A.(-∞,-1)∪[1,+∞) | B.[-1,1] | C.(-∞,-1]∪[1,+∞) | D.(-1,1] |
A.0∉∅ | |||||
B.∅⊆{1,2} | |||||
C.{(x,y)
| |||||
D.若A⊆B,则A∩B=A |
A.{x2-x=0} | B.{x|y=x2-x} | C.{y|y2-y=0} | D.{y|y=x2-x} |
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