题目内容
已知5x2-3x-5=0，则5x2-2x-
=______．
| 1 |
| 5x2-2x-5 |
5x2-2x-
=x+5-
，
∵5x2-3x=5，两边同除以5x得：x-
=
，
∴原式=x+5-
=
．
| 1 |
| 5x2-2x-5 |
| 1 |
| x |
∵5x2-3x=5，两边同除以5x得：x-
| 1 |
| x |
| 3 |
| 5 |
∴原式=x+5-
| 1 |
| x |
| 28 |
| 5 |
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题目内容
| 1 |
| 5x2-2x-5 |
| 1 |
| 5x2-2x-5 |
| 1 |
| x |
| 1 |
| x |
| 3 |
| 5 |
| 1 |
| x |
| 28 |
| 5 |
= ．
= ．