题目内容
| 3 | a
| ||||
|
a
| 9 |
| 8 |
a
．| 9 |
| 8 |
分析：利用有理数指数幂的运算性质和运算法则，把
÷
等价转化为
÷
，由此能求出结果．
| 3 | a
| ||||
|
| 3 | a
| ||||
|
解答：解：
÷
=
÷
=
÷
=a÷a-
=a1+
=a
．
故答案为：a
．
| 3 | a
| ||||
|
=
| 3 | a
| ||||
|
=
| 3 | a3 |
|
=a÷a-
| 1 |
| 8 |
=a1+
| 1 |
| 8 |
=a
| 9 |
| 8 |
故答案为：a
| 9 |
| 8 |
点评：本题考查有理数指数幂的运算性质和运算法则，是基础题．解题时要认真审题，仔细解答．
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