题目内容
计算:
(1)
-2sin60°-(
+2);
(2)计算:cos60°+
-
-2-1.
(1)
| 12 |
| 5 |
(2)计算:cos60°+
| 2 | ||
|
| 8 |
(1)原式=2
-2×
-(
+2)
=2
-
-
-2
=
-
-2;
(2)原式=
+
-2
-
=-
.
| 3 |
| ||
| 2 |
| 5 |
=2
| 3 |
| 3 |
| 5 |
=
| 3 |
| 5 |
(2)原式=
| 1 |
| 2 |
| 2 |
| 2 |
| 1 |
| 2 |
=-
| 2 |
练习册系列答案
相关题目