| 1 |
| (x+1)(x+2) |
| 1 |
| (x+2)(x+3) |
| 1 |
| (x+3)(x+4) |
=（
| 1 |
| x+1 |
| 1 |
| x+2 |
| 1 |
| x+2 |
| 1 |
| x+3 |
| 1 |
| x+3 |
| 1 |
| x+4 |
=
| 1 |
| x+1 |
| 1 |
| x+4 |
=
| 3 |
| x2+5x+4 |
化简分式：1/x2+3x+2+1/x2+5x+6+1/x2+7x+12．
化简分式：
+
+
．
| 1 |
| x2+3x+2 |
| 1 |
| x2+5x+6 |
| 1 |
| x2+7x+12 |
数学人气：881 ℃时间：2019-10-19 17:41:09
优质解答
原式=
+
+
=（
-
）+（
-
）+（
-
）
=
-
=
．
=（
=
=
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