题目
题型：单选题难度：简单来源：不详
| a |
| b |
| c |
| d |
| e |
| f |
| 1 |
| 2 |
| a-3c+2e |
| 2b-6d+4f |
A．
| B．
| C．
| D．
|
答案
| a |
| b |
| c |
| d |
| e |
| f |
| 1 |
| 2 |
∴b=2a，d=2c，f=2e，
把b=2a，d=2c，f=2e代入
| a-3c+2e |
| 2b-6d+4f |
| a-3c+2e |
| 4a-12c+8e |
| 1 |
| 4 |
故选C．
核心考点
举一反三
| x |
| x(x-y) |
| 1 |
| ( ) |
| a |
| b |
| c |
| d |
| e |
| f |
| 1 |
| 2 |
| a-3c+2e |
| 2b-6d+4f |
A．
| B．
| C．
| D．
|
| a |
| b |
| c |
| d |
| e |
| f |
| 1 |
| 2 |
| a-3c+2e |
| 2b-6d+4f |
| a-3c+2e |
| 4a-12c+8e |
| 1 |
| 4 |
| x |
| x(x-y) |
| 1 |
| ( ) |