| x |
| x−3 |
| x+6 |
| x(x−3) |
| 1 |
| x |
=
| x2 |
| x(x−3) |
| x+6 |
| x(x−3) |
| x−3 |
| x(x−3) |
=
| x2−x−6+x−3 |
| x(x−3) |
=
| x2−9 |
| x(x−3) |
=
| (x−3)(x+3) |
| x(x−3) |
=
| x+3 |
| x |
当x=300时，原式=
| 303 |
| 300 |
| 101 |
| 100 |
故选D．
| x |
| x−3 |
| x+6 |
| x2−3x |
| 1 |
| x |
| 101 |
| 990 |
| 111 |
| 110 |
| 101 |
| 100 |
| x |
| x−3 |
| x+6 |
| x(x−3) |
| 1 |
| x |
| x2 |
| x(x−3) |
| x+6 |
| x(x−3) |
| x−3 |
| x(x−3) |
| x2−x−6+x−3 |
| x(x−3) |
| x2−9 |
| x(x−3) |
| (x−3)(x+3) |
| x(x−3) |
| x+3 |
| x |
| 303 |
| 300 |
| 101 |
| 100 |