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的值分別為:-
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 |