题目内容
化简
+
+
+
的结果是( )
| 1 |
| (x+1)(x+2) |
| 1 |
| (x+2)(x+3) |
| 1 |
| (x+3)(x+4) |
| 1 |
| (x+4)(x+5) |
A.
| B.
| C.
| D.
|
原式=
-
+
-
+
-
+
-
=
-
=
.
故选A.
| 1 |
| x+1 |
| 1 |
| x+2 |
| 1 |
| x+2 |
| 1 |
| x+3 |
| 1 |
| x+3 |
| 1 |
| x+4 |
| 1 |
| x+4 |
| 1 |
| x+5 |
=
| 1 |
| x+1 |
| 1 |
| x+5 |
=
| 4 |
| x2+6x+5 |
故选A.
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