题目内容
计算:
(1)
+(2-
)-1-(
)0
(2)
+
-6
+4
.
(1)
| 12 |
| 3 |
| 1 |
| 5 |
(2)
| 18 |
| 1 |
| 2 |
| 12 |
|
| 0.75 |
分析:(1)首先利用负指数幂的性质得出以及二次根式的性质化简各式求出即可;
(2)利用二次根式的性质化简各式进而合并即可.
(2)利用二次根式的性质化简各式进而合并即可.
解答:解:(1)
+(2-
)-1-(
)0
=2
+
-1
=2
+2+
-1
=1+3
;
(2)
+
-6
+4
=3
+
×2
-6×
+4
=3
+
-3
+2
=3
.
| 12 |
| 3 |
| 1 |
| 5 |
=2
| 3 |
| 1 | ||
2-
|
=2
| 3 |
| 3 |
=1+3
| 3 |
(2)
| 18 |
| 1 |
| 2 |
| 12 |
|
| 0.75 |
=3
| 2 |
| 1 |
| 2 |
| 3 |
| ||
| 2 |
|
=3
| 2 |
| 3 |
| 2 |
| 3 |
=3
| 3 |
点评:此题主要二次根式的化简求值,正确化简二次根式是解题关键.
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