题目内容
计算:sin45°-cos45°+
+3tan230°+
=______
| cos30°+tan45° |
| sin90°tan60° |
| sin30° |
| sin60° |
原式=(
)2+
+3×(
)2+
=
+
+
+1+
=
.
| ||
| 2 |
| ||||
1×
|
| ||
| 3 |
| ||||
|
=
| 1 |
| 2 |
| 1 |
| 2 |
| ||
| 3 |
| ||
| 3 |
=
6+2
| ||
| 3 |
练习册系列答案
相关题目