题目内容
用配方法解方程:2x2+3x-1=0.
2x2+3x-1=0
x2+
x=
(1分)
x2+
x+(
)2=
+
(3分)
(x+
)2=
(4分)
x+
=±
(6分)
x1=
x2=
(7分)
x2+
| 3 |
| 2 |
| 1 |
| 2 |
x2+
| 3 |
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
| 9 |
| 16 |
(x+
| 3 |
| 4 |
| 17 |
| 16 |
x+
| 3 |
| 4 |
| ||
| 4 |
x1=
| ||
| 4 |
-
| ||
| 4 |
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| 1 |
| 9 |
A、(x-1)2=
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