题目内容
化简a
b
(-2a
b
)÷(
a
b
) 的结果是( )
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 5 |
| 6 |
分析:直接利用有理数指数幂的运算法则,求解即可.
解答:解:a
b
(-2a
b
)÷(
a
b
)
=-2×2a
+
-
•b
+
-
=-4a.
故选A.
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 5 |
| 6 |
=-2×2a
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=-4a.
故选A.
点评:本题考查有理指数幂的化简求值,是基础题.
练习册系列答案
相关题目
化简(a
b
)(-3a
b
)÷(
a
b
)的结果( )
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
| A、6a |
| B、-a |
| C、-9a |
| D、9a2 |