题目内容
已知a=
,b=
,求
-
的值.
| 1 | ||
3+2
|
| 1 | ||
3-2
|
| 1 |
| b-1 |
| 1 |
| a-1 |
a=3-2
,b=3+2
-
=
-
=
+
=
+
=
| 2 |
| 2 |
| 1 |
| b-1 |
| 1 |
| a-1 |
| 1 | ||
2
|
| 1 | ||
2-2
|
| 1 | ||
2
|
| 1 | ||
2
|
2
| ||
| 4 |
2
| ||
| 4 |
| 2 |
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