| 1 | 1 | 1 | 1 | ||||||||||||||||
− | < | − | |||||||||||||||||
| x |
| x3 |
|
| 1 | 1 | ||
− x < | − x3 | ||
| x | x3 |
| 1 | 1 | 1 | |||
− x < ( | − x)( | + 1 + x2) | |||
| x | x | x2 |
| 1 | 1 | 1 | |||
− x − ( | − x)( | + 1 + x2) < 0 | |||
| x | x | x2 |
| 1 | 1 | |||
( | − x)(1 − | − 1 − x2) < 0 | ||
| x | x2 |
| 1 | 1 | |||
( | − x)( | + x2) > 0 / * x2 | ||
| x | x2 |
| 1 | ||
(x − x3)( | + x2) > 0 | |
| x2 |
| 1 | ||
−x(x − 1)(x + 1)( | + x2) > 0 | |
| x2 |