题目内容
计算：(
+
-
)×
．
|
| 12 |
| 27 |
| 3 |
分析：利用多项式与单项式的乘法法则即可求解．
解答：解：(
+
-
)×
=
×
+
×
-
×
=
+
-
=-2．
|
| 12 |
| 27 |
| 3 |
=
|
| 3 |
| 12 |
| 3 |
| 27 |
| 3 |
=
| 1 |
| 36 |
| 81 |
=-2．
点评：本题主要考查了二次根式的运算，正确运用运算律可以简化运算．
练习册系列答案
相关题目
题目内容
|
| 12 |
| 27 |
| 3 |
|
| 12 |
| 27 |
| 3 |
|
| 3 |
| 12 |
| 3 |
| 27 |
| 3 |
| 1 |
| 36 |
| 81 |