题目内容
(1)3
-5
(2)
-
+
(3)(
+
)2
(4)(2
+3
)(2
-3
)
(5)
-2-1
(6)
+(π-
)0.
| 8 |
| 32 |
(2)
| 27 |
|
| 12 |
(3)(
| 2 |
| 5 |
(4)(2
| 3 |
| 2 |
| 3 |
| 2 |
(5)
| ||||
|
(6)
2
| ||||
|
| 3 |
分析:(1)先化简,再合并同类二次根式即可;
(2)先化简,再合并同类二次根式即可;
(3)运用完全平方公式进行计算即可;
(4)运用平方差公式进行计算即可;
(5)先化简,再计算;
(6)根据零指数幂的性质、二次根式的化简进行计算即可.
(2)先化简,再合并同类二次根式即可;
(3)运用完全平方公式进行计算即可;
(4)运用平方差公式进行计算即可;
(5)先化简,再计算;
(6)根据零指数幂的性质、二次根式的化简进行计算即可.
解答:解:(1)3
-5
=6
-20
=-14
;
(2)
-
+
=3
-
+2
=
;
(3)(
+
)2
=2+2
+5
=7+2
;
(4)(2
+3
)(2
-3
)
=(2
)2-(3
)2
=12-18
=-6;
(5)
-2-1
=
-
=2-
=
;
(6)
+(π-
)0
=
+1
=5+1
=6.
| 8 |
| 32 |
=6
| 2 |
| 2 |
=-14
| 2 |
(2)
| 27 |
|
| 12 |
=3
| 3 |
| ||
| 3 |
| 3 |
=
14
| ||
| 3 |
(3)(
| 2 |
| 5 |
=2+2
| 10 |
=7+2
| 10 |
(4)(2
| 3 |
| 2 |
| 3 |
| 2 |
=(2
| 3 |
| 2 |
=12-18
=-6;
(5)
| ||||
|
=
4
| ||||
|
| 1 |
| 2 |
=2-
| 1 |
| 2 |
=
| 3 |
| 2 |
(6)
2
| ||||
|
| 3 |
=
4
| ||||
|
=5+1
=6.
点评:本题考查了二次根式的混合运算,零指数幂、负整数指数幂,是基础知识比较简单.
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