题目内容
化简a
b
(-3a
b
)÷(
a
b
)的结果为( )
| 2 |
| 3 |
| 1 |
| 2 |
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| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
分析:先计算系数,然后利用同底数幂的乘除运算求解.
解答:解:a
b
(-3a
b
)÷(
a
b
)
=-9a
+
-
•b
+
-
=-9a
•b
=-9a.
故选:B.
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| 6 |
| 5 |
| 6 |
=-9a
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| 3 |
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| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
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| 6 |
=-9a
| 4+3-1 |
| 6 |
| 3+2-5 |
| 6 |
=-9a.
故选:B.
点评:本题考查了有理指数幂的运算性质,是基础的计算题.
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化简(a
b
)(-3a
b
)÷(
a
b
)的结果( )
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| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 6 |
| A、6a |
| B、-a |
| C、-9a |
| D、9a2 |