题目内容
计算:
+
.
| a+1 |
| a2+3a+2 |
| a+3 |
| a2+7a+12 |
原式=
+
=
+
=
.
| a+1 |
| (a+1)(a+2) |
| a+3 |
| (a+3)(a+4) |
=
| 1 |
| a+2 |
| 1 |
| a+4 |
=
| 2a+6 |
| a2+6a+8 |
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题目内容
| a+1 |
| a2+3a+2 |
| a+3 |
| a2+7a+12 |
| a+1 |
| (a+1)(a+2) |
| a+3 |
| (a+3)(a+4) |
| 1 |
| a+2 |
| 1 |
| a+4 |
| 2a+6 |
| a2+6a+8 |