题目内容
分解因式:x2+x-1=______.
x2+x-1
=(x+
)2-
=(x+
)2-(
)2
=(x+
+
)(x+
-
)
=(x+
)(x+
).
故答案为:(x+
)(x+
).
=(x+
| 1 |
| 2 |
| 5 |
| 4 |
=(x+
| 1 |
| 2 |
| ||
| 2 |
=(x+
| 1 |
| 2 |
| ||
| 2 |
| 1 |
| 2 |
| ||
| 2 |
=(x+
1+
| ||
| 2 |
1-
| ||
| 2 |
故答案为:(x+
1+
| ||
| 2 |
1-
| ||
| 2 |
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