题目内容
化简：| x-1 |
| x |
| 1 |
| x |
分析：此题的运算顺序：先括号里，经过通分，再把除法转化为乘法，约分化为最简．
解答：解：原式=
÷
=
•
=
．
| x-1 |
| x |
| x2-1 |
| x |
=
| x-1 |
| x |
| x |
| (x+1)(x-1) |
=
| 1 |
| x+1 |
点评：本题的关键是通分、分解因式、约分，用到了平方差公式．
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题目内容
化简：| x-1 |
| x |
| 1 |
| x |
| x-1 |
| x |
| x2-1 |
| x |
| x-1 |
| x |
| x |
| (x+1)(x-1) |
| 1 |
| x+1 |