题目内容
已知a=3,b=
,求(
-
)•
的值.
| 2 |
| 1 |
| a |
| 1 |
| b |
| 3 |
| a-b |
(
-
)•
=
•
=-
,
当a=3,b=
时,原式=-
=-
.
| 1 |
| a |
| 1 |
| b |
| 3 |
| a-b |
=
| b-a |
| ab |
| 3 |
| a-b |
=-
| 3 |
| ab |
当a=3,b=
| 2 |
| 1 | ||
3×
|
| ||
| 6 |
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题目内容
| 2 |
| 1 |
| a |
| 1 |
| b |
| 3 |
| a-b |
| 1 |
| a |
| 1 |
| b |
| 3 |
| a-b |
| b-a |
| ab |
| 3 |
| a-b |
| 3 |
| ab |
| 2 |
| 1 | ||
3×
|
| ||
| 6 |