题目内容
已知
=
≠0,求代数式
•(a-2b)的值.
| a |
| 2 |
| b |
| 3 |
| 5a-2b |
| a2-4b2 |
| 5a-2b |
| a2-4b2 |
=
| 5a-2b |
| (a+2b)(a-2b) |
=
| 5a-2b |
| a+2b |
∵
| a |
| 2 |
| b |
| 3 |
| 2 |
| 3 |
∴原式=
| ||
|
| 10b-6b |
| 2b+6b |
| 4b |
| 8b |
| 1 |
| 2 |
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题目内容
| a |
| 2 |
| b |
| 3 |
| 5a-2b |
| a2-4b2 |
| 5a-2b |
| a2-4b2 |
| 5a-2b |
| (a+2b)(a-2b) |
| 5a-2b |
| a+2b |
| a |
| 2 |
| b |
| 3 |
| 2 |
| 3 |
| ||
|
| 10b-6b |
| 2b+6b |
| 4b |
| 8b |
| 1 |
| 2 |