题目内容
已知a=
+1,求(a+
)2-4(a+
)+4的值.
| 3 |
| 1 |
| a |
| 1 |
| a |
由题意得a+
=
+1+
=
+1+
=
,
而(a+
)2-4(a+
)+4=(a+
-2)2,
∴原式=(
-2)2=9-
.
| 1 |
| a |
| 3 |
| 1 | ||
|
| 3 |
| ||
| 2 |
3
| ||
| 2 |
而(a+
| 1 |
| a |
| 1 |
| a |
| 1 |
| a |
∴原式=(
3
| ||
| 2 |
| 9 |
| 2 |
| 3 |
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