题目内容
(1)6
(
-
)-2
(2)(
+1)÷
×(1-
)+3
÷
-
.
| 2 |
|
| 6 |
| 48 |
(2)(
| 3 |
| 1 | ||
|
| 3 |
|
| 3 |
| 2 |
2
|
(1-
|
分析:(1)先把各二次根式化为最简二次根式,再进行二次根式的乘法运算,然后合并即可;
(2)先把除法运算化为乘法运算得到原式=(
+1)(
-1)×(1-
)+3×
×
-|1-
|,然后进行二次根式的乘法运算,然后合并即可.
(2)先把除法运算化为乘法运算得到原式=(
| 3 |
| 3 |
| 3 |
| 2 |
| 3 |
|
| 3 |
解答:解:(1)原式=6
(
-
)-8
=6
×
-6
×
-8
=3-12
-8
=3-20
;
(2)原式=(
+1)(
-1)×(1-
)+3×
×
-|1-
|
=2-2
+
+1-
=3-3
+
.
| 2 |
| ||
| 4 |
| 6 |
| 3 |
=6
| 2 |
| ||
| 4 |
| 2 |
| 6 |
| 3 |
=3-12
| 3 |
| 3 |
=3-20
| 3 |
(2)原式=(
| 3 |
| 3 |
| 3 |
| 2 |
| 3 |
|
| 3 |
=2-2
| 3 |
| ||
| 10 |
| 3 |
=3-3
| 3 |
| ||
| 10 |
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,然后合并同类二次根式.
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