| x+8 |
| (x−2)2 |
| x(x−2) |
| x+3 |
| 1 |
| x−2 |
| x(x−2) |
| x+3 |
| x(x+8) |
| (x−2)(x+3) |
| x(x−2) |
| (x−2)(x+3) |
| 2x(x+3) |
| (x−2)(x+3) |
| 2x |
| x−2 |
方程x2-4=0，解得：x=2或-2，
当x=2时，原式没有意义，舍去，
则当x=-2时，原式=1．
| x+8 |
| x2−4x+4 |
| 1 |
| 2−x |
| x+3 |
| x2−2x |
| x+8 |
| (x−2)2 |
| x(x−2) |
| x+3 |
| 1 |
| x−2 |
| x(x−2) |
| x+3 |
| x(x+8) |
| (x−2)(x+3) |
| x(x−2) |
| (x−2)(x+3) |
| 2x(x+3) |
| (x−2)(x+3) |
| 2x |
| x−2 |