题目内容
计算:
=
=
;
•
=
| 16 |
4
4
;
|
| ||
| 3 |
| ||
| 3 |
| 3 |
| 6 |
3
| 2 |
3
.| 2 |
分析:由二次的性质根式的性质得到
=
=4;根据二次根式的除法得到
=
,然后分母有理化;先根据二次根式的乘法得到
×
=
×
×
,然后根据二次根式的性质化简.
| 16 |
| 42 |
|
| ||
|
| 3 |
| 6 |
| 3 |
| 3 |
| 2 |
解答:解:
=
=4;
=
=
=
;
×
=
×
×
=3
.
故答案为4;
;3
.
| 16 |
| 42 |
|
| ||
|
| ||||
|
| ||
| 3 |
| 3 |
| 6 |
| 3 |
| 3 |
| 2 |
| 2 |
故答案为4;
| ||
| 3 |
| 2 |
点评:本题考查了二次根式的乘除法:
•
=
(a≥0,b≥0);
=
(a≥0,b>0).也考查了二次根式的性质.
| a |
| b |
| ab |
| ||
|
|
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