题目内容
已知5x2-3x-5=0,则5x2+2x-8-
=______.
| 5 |
| 5x2-2x-5 |
由于5x2-3x-5=0,则5x2=3x+5;
5x2+2x-8-
,
=3x+5+2x-8-
,
=5x-3-
,
=
,
=0.
故答案为:0.
5x2+2x-8-
| 5 |
| 5x2-2x-5 |
=3x+5+2x-8-
| 5 |
| 3x+5-2x-5 |
=5x-3-
| 5 |
| x |
=
| 5x2-3x-5 |
| x |
=0.
故答案为:0.
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