题目内容
计算:(1)
-tan45°;
(2)
-2
+
.
| sin60° |
| cos30° |
(2)
| 32 |
|
| 1 | ||
|
(1)原式=
-1=1-1=0;
(2)原式=4
-2×
+
=4
-
+
=4
.
| ||||
|
(2)原式=4
| 2 |
| ||
| 4 |
| ||
| 2 |
| 2 |
| ||
| 2 |
| ||
| 2 |
| 2 |
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题目内容
| sin60° |
| cos30° |
| 32 |
|
| 1 | ||
|
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|
| 2 |
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| 4 |
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| 2 |
| 2 |
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| 2 |
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| 2 |
| 2 |