题目内容
计算:| 3 |
| 5 |
| xy3 |
| 4 |
| 15 |
|
| 5 |
| 6 |
| x3y |
分析:根据二次根式的乘除法运算法则进行计算.
解答:解:原式=
•(-
)•(-
)
=-
•(-
)
=-
xy•(-
x
)
=
x2y
.
| 3 |
| 5 |
| xy3 |
| 15 |
| 4 |
|
| 5 |
| 6 |
| x3y |
=-
| 9 |
| 4 |
| x2y2 |
| 5 |
| 6 |
| x3y |
=-
| 9 |
| 4 |
| 5 |
| 6 |
| xy |
=
| 15 |
| 8 |
| xy |
点评:正确理解二次根式乘除法、积的算术平方根等概念是解答问题的关键.
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