| −3 |
| 2(x−2) |
| x−2 |
| 1 |
| (x+2)(x−2) |
| x2+3x−2 |
=-
| 3x2−12 |
| 2x2+6x−4 |
（2）原式=
| −(x+1)(x−1) |
| (x−3)(x+2) |
| (x−3)2 |
| 2(x+1)(x+2) |
| 5(x+2)2 |
| (x−3)(x−1) |
=-
| 5 |
| 2 |
| −3 |
| 2x−4 |
| 1 |
| x−2 |
| x2−4 |
| x2+3x−2 |
| 1−x2 |
| x2−x−6 |
| 9−6x+x2 |
| 2x2+6x+4 |
| x2−4x+3 |
| 5x2+20x+20 |
| −3 |
| 2(x−2) |
| x−2 |
| 1 |
| (x+2)(x−2) |
| x2+3x−2 |
| 3x2−12 |
| 2x2+6x−4 |
| −(x+1)(x−1) |
| (x−3)(x+2) |
| (x−3)2 |
| 2(x+1)(x+2) |
| 5(x+2)2 |
| (x−3)(x−1) |
| 5 |
| 2 |