题目内容
计算题:(1)3
| 2 |
| 3 |
| 2 |
| 3 |
(2)
| 32 |
| 2 |
(3)
| 6 | ||
|
| 18 |
| 1 |
| 2 |
分析:(1)直接合并最简二次根式即可;
(2)先用完全平方公式展开,把各二次根式化为最简二次根式,再进行计算;
(3)把各二次根式化为最简二次根式,再进行计算,注意(
)0=1.
(2)先用完全平方公式展开,把各二次根式化为最简二次根式,再进行计算;
(3)把各二次根式化为最简二次根式,再进行计算,注意(
| 1 |
| 2 |
解答:解:(1)3
+
-2
-3
=(3
-2
)+(
-3
)
=
-2
;
(2)
-(2+
)2
=4
-[4+4
+(
)2]
=4
-4-4
-2
=-6;
(3)
-
-(
)0
=
-3
-1
=3
-3
-1
=-1.
| 2 |
| 3 |
| 2 |
| 3 |
=(3
| 2 |
| 2 |
| 3 |
| 3 |
=
| 2 |
| 3 |
(2)
| 32 |
| 2 |
=4
| 2 |
| 2 |
| 2 |
=4
| 2 |
| 2 |
=-6;
(3)
| 6 | ||
|
| 18 |
| 1 |
| 2 |
=
6
| ||
| 2 |
| 2 |
=3
| 2 |
| 2 |
=-1.
点评:本题考查的是二次根式的混合运算,在进行此类运算时一般先把二次根式化为最简二次根式的形式后再运算.
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