x+1 |
x-1 |
x+1 |
x-1 |
-x+1 |
-x-1 |
x-1 |
x+1 |
x+1 |
x-1 |
x1+1 |
x1-1 |
x2+1 |
x2-1 |
2(x2-x1) |
(x1-1)(x2-1) |
x1+1 |
x1-1 |
x2+1 |
x2-1 |
x1+1 |
x1-1 |
x2+1 |
x2-1 |
|
|
|
|
2 |
2 |
2 |
A.[0,1] | B.[2,3] | C.[-2,-1] | D.无法确定 |
2x2+x+1 |
x2 |
A.0∈C | B.-1∈C | C.3∈C | D.1∈C |
25 |
4 |
25 |
4 |
1 |
4 |
| ||
x-1 |
2-x |
x |
A.[
| B.[0,
| C.[
| D.[
|
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