题目
题型：单选题难度：一般来源：不详
| (x-1)2 |
| A．x-1 | B．1-x | C．1 | D．-1 |
答案
∴x≤0，
∴x-1＜0，
∴
| (x-1)2 |
故选B．
核心考点
举一反三
| a |
| |b| |
| a |
| |b| |
| A．2 | B．3 | C．4 | D．5 |
| 1 |
| (a-1)(b+1) |
| 1 |
| (a-2)(b+2) |
| 1 |
| (a-2000)(b+2000) |
| a |
| |a| |
| b |
| |b| |
| c |
| |c| |
| (x-1)2 |
| A．x-1 | B．1-x | C．1 | D．-1 |
| (x-1)2 |
| a |
| |b| |
| a |
| |b| |
| A．2 | B．3 | C．4 | D．5 |
| 1 |
| (a-1)(b+1) |
| 1 |
| (a-2)(b+2) |
| 1 |
| (a-2000)(b+2000) |
| a |
| |a| |
| b |
| |b| |
| c |
| |c| |