题目：
（2007·威海）方程3x2-5x+1=0的解为x1=
，x2=
5+
| ||
| 6 |
5-
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| 6 |
x1=
，x2=
．5+
| ||
| 6 |
5-
| ||
| 6 |
答案
x1=
，x2=
5+
| ||
| 6 |
5-
| ||
| 6 |
解：∵a=3，b=-5，c=1
∴b2-4ac=13
∴x=
5±
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| 6 |
∴x1=
5+
| ||
| 6 |
5-
| ||
| 6 |
5+
| ||
| 6 |
5-
| ||
| 6 |
5+
| ||
| 6 |
5-
| ||
| 6 |
5+
| ||
| 6 |
5-
| ||
| 6 |
5±
| ||
| 6 |
5+
| ||
| 6 |
5-
| ||
| 6 |
