题目内容
已知a2-3a+1=0,则a+
=______,a2+
=______.
| 1 |
| a |
| 1 |
| a2 |
∵a2-3a+1=0,
∴a2+1=3a,
∴a+
=
=
=3,
∵a2-3a+1=0,
∴a2+1=3a,
∴(a2+1)2=9a2,
∴a4+1=7a2,
∵a2+
=
=
=7
故答案为3,7.
∴a2+1=3a,
∴a+
| 1 |
| a |
| a 2+1 |
| a |
| 3a |
| a |
∵a2-3a+1=0,
∴a2+1=3a,
∴(a2+1)2=9a2,
∴a4+1=7a2,
∵a2+
| 1 |
| a2 |
| a 4+1 |
| a 2 |
| 7a 2 |
| a 2 |
故答案为3,7.
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