题目内容
2
-3
-
+
.
| 75 |
| 18 |
| 1 |
| 2 |
| 48 |
| 1 |
| 6 |
| 288 |
分析:先把各二次根式化为最简二次根式得到原式=2×5
-3×3
-
×4
+
×12
=10
-9
-2
+2
,然后合并同类二次根式即可.
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 1 |
| 6 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
解答:解:原式=2×5
-3×3
-
×4
+
×12
=10
-9
-2
+2
=8
-7
.
| 3 |
| 2 |
| 1 |
| 2 |
| 3 |
| 1 |
| 6 |
| 2 |
=10
| 3 |
| 2 |
| 3 |
| 2 |
=8
| 3 |
| 2 |
点评:本题考查了二次根式的加减法:先把各二次根式化为最简二次根式,然后合并同类二次根式.
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