题目内容
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 |
分析:由指数幂的运算法则直接化简即可.
解答:解:(a
b
)(-3a
b
)÷(
a
b
)=(-3)÷
×a
+
-
b
+
-
=-9a
故选C
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
故选C
点评:本题考查指数式的化简、指数幂的运算法则,考查运算能力.
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