题目内容
计算：| 12 |
|
| 7 |
| 9 |
| 1 |
| 2 |
| 3 |
分析：由于
=2
，
=
．3-1=
；注意分数指数的意义：(2
)
=
=
=
，∵1-
＜0，∴|1-
|=
-1．利用这些即可求解．
| 12 |
| 3 |
|
| ||
| 3 |
| 1 |
| 3 |
| 7 |
| 9 |
| 1 |
| 2 |
2
|
|
| 5 |
| 3 |
| 3 |
| 3 |
| 3 |
解答：解：原式=2
+
-
+
-(
-1)
=2
+
-
+
-
+1
=
+
．
| 3 |
| 1 |
| 3 |
| 3 |
| 1 |
| 3 |
|
| 3 |
=2
| 3 |
| 1 |
| 3 |
| 3 |
| 1 |
| 3 |
| 5 |
| 3 |
| 3 |
=
| 4 |
| 3 |
| 3 |
| 7 |
| 3 |
点评：此题主要考查了实数的运算，解题应特别注意：分数指数的分子是该数的次数，分母是该数开方的根指数．
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