题目内容
已知x+
=3,求
的值.
| 1 |
| x |
| x2 |
| x4+x2+1 |
将x+
=3两边同时乘以x,得x2+1=3x,
=
=
=
.
| 1 |
| x |
| x2 |
| x4+x2+1 |
| x2 |
| (x2+1)2-x2 |
| x2 |
| 9x2-x2 |
| 1 |
| 8 |
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题目内容
| 1 |
| x |
| x2 |
| x4+x2+1 |
| 1 |
| x |
| x2 |
| x4+x2+1 |
| x2 |
| (x2+1)2-x2 |
| x2 |
| 9x2-x2 |
| 1 |
| 8 |