题目内容
求下列各数的和:-| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
|
分析:根据负整数指数幂、绝对值、零指数幂、二次根式等知识点进行解答.
解答:解:由题意得:
-
•(
)-1+|
|•(
)0+
=-
×2+
×1+
=-1+
+
=-
+
.
-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
|
=-
| 1 |
| 2 |
| 1 |
| 2 |
| ||
| 2 |
=-1+
| 1 |
| 2 |
| ||
| 2 |
=-
| 1 |
| 2 |
| ||
| 2 |
点评:非0数的负指数次幂是正指数次幂的倒数,它的0次幂是1.
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