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-x1)(1+x2) |
(1-x2)(1+x1) |
(1-x1)(1+x2) |
(1-x2)(1+x1) |
(1-x1)(1+x2) |
(1-x2)(1+x1) |
|
1 |
2 |
A.-1 | B.
| C.-1或
| D.1或-
|
A.(-∞,4] | B.[4,+∞) | C.[-2,4] | D.(-2,4] |
A.x-y=0 | B.x-y≤0 | C.x+y≥0 | D.x+y≤0 |
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