2x-3 |
2x+3 |
A.(-∞,-1)∪(-1,+∞) | B.(-∞,1)∪(1,+∞) |
C.(-∞,0)∪(0,+∞) | D.(-∞,0)∪(1,+∞) |
2x+3-6 |
2x+3 |
-6 |
2x+3 |
1-x2 |
x2-1 |
A.{x|-1≤x≤1} | B.{x|x≤-1或x≥1} | C.{x|0≤x≤1} | D.{-1,1} |
|
1 |
2 |
1 |
ax+1 |
a |
f(x) |
25 |
4 |
A.(0,4] | B.[-
| C.[
| D.[
|
-x2+4x |
A.[-2,2] | B.[1,2] | C.[0,2] | D.[-
|
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