题目内容
已知x2-4x+1=0,求x4+
的值.______
| 1 |
| x4 |
∵x2-4x+1=0,
∴x-4+
=0,
即x+
=4,
∴x2+
=(x+
)2-2,
=42-2,
=14,
∴x4+
=(x2+
)2-2,
=142-2,
=194.
故答案为:194.
∴x-4+
| 1 |
| x |
即x+
| 1 |
| x |
∴x2+
| 1 |
| x2 |
| 1 |
| x |
=42-2,
=14,
∴x4+
| 1 |
| x4 |
| 1 |
| x2 |
=142-2,
=194.
故答案为:194.
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