| (x+2)(x−2) |
| (x−2)2 |
| x−2 |
| x+2 |
| x−2 |
| x |
=
| (x+2)2−(x−2)2 |
| (x+2)(x−2) |
| x−2 |
| x |
=
| 8x |
| (x+2)(x−2) |
| x−2 |
| x |
=
| 8 |
| x+2 |
∵原式中,x=2或x=-2时,分母为0,分式无意义,故x≠2且x≠-2,
同时,x=0时,
| x−2 |
| x |
当x=6时,原式=1.
| x2−4 |
| x2−4x+4 |
| 2−x |
| x+2 |
| x |
| x−2 |
| (x+2)(x−2) |
| (x−2)2 |
| x−2 |
| x+2 |
| x−2 |
| x |
| (x+2)2−(x−2)2 |
| (x+2)(x−2) |
| x−2 |
| x |
| 8x |
| (x+2)(x−2) |
| x−2 |
| x |
| 8 |
| x+2 |
| x−2 |
| x |