题目内容
已知方程2x2+5x-3=0,则此方程的两个根的倒数和是______.
设方程2x2+5x-3=0的两根为α、β.则
α+β=-
,α•β=-
,
所以,
+
=
=
=
;
故答案是:
.
α+β=-
| 5 |
| 2 |
| 3 |
| 2 |
所以,
| 1 |
| α |
| 1 |
| β |
| α+β |
| αβ |
-
| ||
-
|
| 5 |
| 3 |
故答案是:
| 5 |
| 3 |
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题目内容
| 5 |
| 2 |
| 3 |
| 2 |
| 1 |
| α |
| 1 |
| β |
| α+β |
| αβ |
-
| ||
-
|
| 5 |
| 3 |
| 5 |
| 3 |