| a+2 |
| a(a−2) |
| (a−2)2 |
| a+2 |
=
| a−2 |
| a |
（2）原式=
| 2x(x+2)−x(x−2) |
| (x−2)(x+2) |
| (x+2)(x−2) |
| x |
=
| x(x+3) |
| (x+2)(x−2) |
| (x+2)(x−2) |
| x |
=x+3．
| a+2 |
| a2−2a |
| a2−4a+4 |
| a+2 |
| 2x |
| x−2 |
| x |
| x+2 |
| x |
| x2−4 |
| a+2 |
| a(a−2) |
| (a−2)2 |
| a+2 |
| a−2 |
| a |
| 2x(x+2)−x(x−2) |
| (x−2)(x+2) |
| (x+2)(x−2) |
| x |
| x(x+3) |
| (x+2)(x−2) |
| (x+2)(x−2) |
| x |