题目内容
计算:| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 27 |
分析:运用分配律将
,
分别乘进括号里,化简二次根式,再合并同类二次根式.
| 1 |
| 2 |
| 3 |
| 4 |
解答:解:原式=
+
-
+
=-
+
.
| ||
| 2 |
| ||
| 2 |
3
| ||
| 4 |
9
| ||
| 4 |
=-
| ||
| 4 |
11
| ||
| 4 |
点评:熟练运用混合运算法则,计算时还要灵活,使之更简便.
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题目内容
计算:| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 27 |
| 1 |
| 2 |
| 3 |
| 4 |
| ||
| 2 |
| ||
| 2 |
3
| ||
| 4 |
9
| ||
| 4 |
| ||
| 4 |
11
| ||
| 4 |