问题
解答题
已知
|
答案
∵
| 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 |
搜题请搜索小程序“爱下问搜题”
已知
|
∵
| 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 |
