| A |
| x |
| B |
| x−1 |
| C |
| x+2 |
| A(x−1)(x+2)+Bx(x+2)+Cx(x−1) |
| x(x−1)(x+2) |
=
| (A+B+C)x2+(A+2B−C)x−2A |
| x(x−1)(x+2) |
| 2x+3 |
| x(x−1)(x+2) |
∴
|
解得:
|
∴A、B、C的值分别为:-
| 3 |
| 2 |
| 5 |
| 3 |
| 1 |
| 6 |
| 2x+3 |
| x(x−1)(x+2) |
| A |
| x |
| B |
| x−1 |
| C |
| x+2 |
| A |
| x |
| B |
| x−1 |
| C |
| x+2 |
| A(x−1)(x+2)+Bx(x+2)+Cx(x−1) |
| x(x−1)(x+2) |
| (A+B+C)x2+(A+2B−C)x−2A |
| x(x−1)(x+2) |
| 2x+3 |
| x(x−1)(x+2) |
|
|
| 3 |
| 2 |
| 5 |
| 3 |
| 1 |
| 6 |