|
A.(0,+∞) | B.(1,+∞) | C.(-1,+∞) | D.(-∞,-1) |
1 |
a |
1 |
a |
1 |
a |
1 |
a |
1 |
a |
A.(-∞,0] | B.(-∞,1] | C.[1,2] | D.[1,+∞) |
1 |
2 |
A.(1,+∞) | B.(-1,1) | C.(0,+∞) | D.(0,1) |
A.{1} | B.{0} | C.{-1} | D.{-1,0,1} |
A.(-1,3) | B.[-2,1) | C.{0,1,2} | D.{-2,-1,0} |
kπ |
2 |
π |
3 |
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