题目内容
已知
=
+
,求A、B的值.
| 2x+1 |
| (x-1)(x+2) |
| A |
| x-1 |
| B |
| x+2 |
∵
+
=
=
,
∵
=
+
,
∴
,
解得:A=1,B=1.
| A |
| x-1 |
| B |
| x+2 |
| A(x+2)+B(x-1) |
| (x-1)(x+2) |
| (A+B)x+2A-B |
| (x-1)(x+2) |
∵
| 2x+1 |
| (x-1)(x+2) |
| A |
| x-1 |
| B |
| x+2 |
∴
|
解得:A=1,B=1.
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