题目内容
x2+3x+______=（x+______）2；x2-
x+______=（x+______）2．
| 4 |
| 3 |
∵3x=2×
•x，
∴x2+3x+
=（x+
）2；
∵
x=2×
•x，
∴x2-
x+
=（x-
）2．
| 3 |
| 2 |
∴x2+3x+
| 9 |
| 4 |
| 3 |
| 2 |
∵
| 4 |
| 3 |
| 2 |
| 3 |
∴x2-
| 4 |
| 3 |
| 4 |
| 9 |
| 2 |
| 3 |
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