题目内容
计算:(2
-
)×
-(3+
)÷2
.
|
| 50 |
| 6 |
| 24 |
| 3 |
分析:先把各二次根式化为最简二次根式得到原式=(
-5
)×
-(3+2
)÷2
,再把除法运算转化为乘法得到原式=
×
-5
×
-3×
-2
×
,然后进行乘法运算,最后合并同类二次根式即可.
2
| ||
| 3 |
| 2 |
| 6 |
| 6 |
| 3 |
2
| ||
| 3 |
| 6 |
| 2 |
| 6 |
| 1 | ||
2
|
| 6 |
| 1 | ||
2
|
解答:解:原式=(
-5
)×
-(3+2
)÷2
=
×
-5
×
-3×
-2
×
=2
-10
-
-
=
-
.
2
| ||
| 3 |
| 2 |
| 6 |
| 6 |
| 3 |
=
2
| ||
| 3 |
| 6 |
| 2 |
| 6 |
| 1 | ||
2
|
| 6 |
| 1 | ||
2
|
=2
| 2 |
| 3 |
| ||
| 2 |
| 2 |
=
| 2 |
21
| ||
| 2 |
点评:本题考查了二次根式的混合运算:先把各二次根式化为最简二次根式,再进行二次根式的乘除运算,然后进行二次根式的加减运算.
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