题目内容
(1)(2008-π)0+(
)-1-
cos45°;
(2)当x=-
时,求(
-
)÷
的值.
| 1 |
| 3 |
| 2 |
(2)当x=-
| 1 |
| 3 |
| 3x |
| x-1 |
| x |
| x+1 |
| x |
| x2-1 |
(1)(2008-π)0+(
| 1 |
| 3 |
| 2 |
=1+3-1
=3;
(2)(
| 3x |
| x-1 |
| x |
| x+1 |
| x |
| x2-1 |
=3(x+1)-(x-1)
=2x+4.
当x=-
| 1 |
| 3 |
原式=-
| 2 |
| 3 |
| 10 |
| 3 |
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