题目内容
计算：
①
sin60°+tan60°-2cos230°
②
+
①
| 3 |
②
| cos60° |
| 1+sin60° |
| 1 |
| tan30° |
①原式=
×
+
-2×（
）2
=
+
-
=
．
②原式=
+
=
+
=2-
+
=2．
| 3 |
| ||
| 2 |
| 3 |
| ||
| 2 |
=
| 3 |
| 2 |
| 3 |
| 3 |
| 2 |
=
| 3 |
②原式=
| ||||
1+
|
| 1 | ||||
|
=
| ||||
|
| 3 |
=2-
| 3 |
| 3 |
=2．
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