题目：
计算化简（1）计算：
| 12 |
| 1 |
| 2 |
| 1 |
| 2-tan60° |
（2）化简：(
| 2x |
| x2-9 |
| 1 |
| 3-x |
| x |
| x+3 |
答案
解：（1）原式=2| 3 |
| 1 | ||
2-
|
=2
| 3 |
| 3 |
=
| 3 |
（2）原式=[
| 2x |
| (x+3)(x-3) |
| 1 |
| x-3 |
| x |
| x+3 |
=
| 2x-(x+3) |
| (x+3)(x-3) |
| x+3 |
| x |
=
| 1 |
| x |
当x=1时，原式=1．
解：（1）原式=2
| 3 |
| 1 | ||
2-
|
=2
| 3 |
| 3 |
=
| 3 |
（2）原式=[
| 2x |
| (x+3)(x-3) |
| 1 |
| x-3 |
| x |
| x+3 |
=
| 2x-(x+3) |
| (x+3)(x-3) |
| x+3 |
| x |
=
| 1 |
| x |
当x=1时，原式=1．
（2009·三明）如图，△ABC是边长为2的等边三角形，将△ABC沿射线BC向右平移得到△DCE，连接AD、BD，下列结论错误的是（ ）