题目
| x2-3x+1 |
| x+1 |
答案
| x2-3x+1 |
| x+1 |
| (x+1)2-5(x+1)+5 |
| x+1 |
=（x+1）+
| 5 |
| x+1 |
∵x＞-1
∴x+1＞0
∴（x+1）+
| 5 |
| x+1 |
解析 |
已知x＞-1，求y=x2-3x+1x+1
=（x+1）+
∵x＞-1
∴x+1＞0
∴（x+1）+
=（x+1）+
∵x＞-1
∴x+1＞0
∴（x+1）+
=（x+1）+
∵x＞-1
∴x+1＞0
∴（x+1）+
| x2-3x+1 |
| x+1 |
| x2-3x+1 |
| x+1 |
| (x+1)2-5(x+1)+5 |
| x+1 |
| 5 |
| x+1 |
| 5 |
| x+1 |
解析 |