题目内容
计算
+
| sin50° | ||
|
| 1+cos45° |
| tan230°-sin260° |
原式=
+
=1+
=1-
=-
.
| sin50° |
| cos40° |
1+
| ||||||||
(
|
1+
| ||||
|
12+6
| ||
| 5 |
7+6
| ||
| 5 |
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