题目内容
用配方法证明代数式2x2-x+3的值不小于
.
| 23 |
| 8 |
证明:2x2-x+3=2(x2-
x+
)-
+3,
=2(x-
)2+
≥
,
即可证明代数式2x2-x+3的值不小于
.
| 1 |
| 2 |
| 1 |
| 16 |
| 1 |
| 8 |
=2(x-
| 1 |
| 4 |
| 23 |
| 8 |
| 23 |
| 8 |
即可证明代数式2x2-x+3的值不小于
| 23 |
| 8 |
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