题目内容
计算:(1)
| 0.5 |
| 32 |
|
|
| 75 |
2-3
| ||
|
| ||||
|
| 3 |
| 2 |
| 3 |
| 2 |
分析:根据实数的混合运算解答,二次根式要先化简成最简二次根式后计算,能用公式的尽量用公式.
解答:解:(1)原式=
+4
-
-
-5
=
+
-
-
-5
=
+
-
-(
+5
)
=
-
;
(2)原式=
+
-(3-8)
=
+
+5
=
-3+1-
+5
=3.
|
| 2 |
2
| ||
| 3 |
| ||
| 4 |
| 3 |
=
| ||
| 2 |
| 2 |
2
| ||
| 3 |
| ||
| 4 |
| 3 |
=
| ||
| 2 |
2
| ||
| 2 |
| ||
| 4 |
2
| ||
| 3 |
| 3 |
=
5
| ||
| 4 |
17
| ||
| 3 |
(2)原式=
(2-3
| ||||
| 2 |
(
| ||||||
| 3 |
=
2
| ||
| 2 |
3-3
| ||
| 3 |
=
| 2 |
| 2 |
=3.
点评:本题主要考查了实数的运算,其中涉及到二次根式的加减混合运算,在计算时要按照运算法则计算,能用公式的尽量用公式以简化计算.
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