题目内容
计算：
-
．
| 1 |
| x+3 |
| 3x+5 |
| x2+2x-3 |
原式=
-
=
=
=-
．
| 1 |
| x+3 |
| 3x+5 |
| (x+3)(x-1) |
| x-1-(3x+5) |
| (x+3)(x-1) |
| -2x-6 |
| (x+3)(x-1) |
| 2 |
| x-1 |
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题目内容
| 1 |
| x+3 |
| 3x+5 |
| x2+2x-3 |
| 1 |
| x+3 |
| 3x+5 |
| (x+3)(x-1) |
| x-1-(3x+5) |
| (x+3)(x-1) |
| -2x-6 |
| (x+3)(x-1) |
| 2 |
| x-1 |