题目内容
请你先化简分式
÷
+
，再取恰当x的值代入求值．
| x+3 |
| x2-1 |
| x2+6x+9 |
| x2-2x+1 |
| 1 |
| x+1 |
| x+3 |
| x2-1 |
| x2+6x+9 |
| x2-2x+1 |
| 1 |
| x+1 |
=
| x+3 |
| (x+1)(x-1) |
| (x-1)2 |
| (x+3)2 |
| 1 |
| x+1 |
=
| 1 |
| x+1 |
| x-1 |
| x+3 |
| 1 |
| x+1 |
=
| 1 |
| x+1 |
| x-1 |
| x+3 |
=
| 1 |
| x+1 |
| 2(x+1) |
| x+3 |
=
| 2 |
| x+3 |
∵x2-1≠0，x+3≠0，x-1≠0，x+1≠0，
∴取x=2，
代入得：原式=
| 2 |
| 2+3 |
| 2 |
| 5 |
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