1-x |
1+x |
a+b |
1+ab |
1+(-x) |
1-(-x) |
1-x |
1+x |
1+x |
1-x |
1+x |
1-x |
1-a |
1+a |
1-b |
1+b |
1-a-b+ab |
1+a+b+ab |
a+b |
1+ab |
1-
| ||
1+
|
1+ab-a-b |
1+ab+a+b |
a+b |
1+ab |
1+x2 |
1-x2 |
1+x1 |
1-x1 |
(1-x1)(1+x2) |
(1+x1)(1-x2) |
(1-x1)(1+x2) |
(1+x1)(1-x2) |
(1-x1)(1+x2) |
(1+x1)(1-x2) |
1+x |
1-x |
A.[
| B.(-∞,
| C.(3,+∞) | D.(-∞,-
|
1 |
2 |
A.-1≤x≤2 | B.2≤x≤4 | C.
| D.
|
1 |
3 |
A.(-∞,1) | B.(2,+∞) | C.(-∞,
| D.(
|
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