题目
题型：解答题难度：一般来源：马尾区
| x2+2x |
| x-1 |
| 1 |
| x |
答案
| x2+2x |
| x-1 |
| 1 |
| x |
=
| x2+2x |
| x-1 |
| x-1 |
| x |
=
| x(x+2) |
| x-1 |
| x-1 |
| x |
=x+2，
当x=2时，x+2=4．
故答案为4．
核心考点
举一反三
| A．甲合算 | B．乙合算 |
| C．甲、乙一样 | D．要看两次的价格情况 |
| x2-1 |
| x2-2x+1 |
| x2-2x |
| x-2 |
| 2 |
| 3 |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
| 1 |
| a |
| 1 |
| a |
| A．a-1 | B．-a-1 | C．1-a | D．a+1 |