题目内容
计算:
(1)tan60°-
+(
)-1+(-2007)0;
(2) 6tan230°-
sin 60°-2sin 45°
(1)tan60°-
| 2 | ||
|
| 1 |
| 2 |
(2) 6tan230°-
| 3 |
(1)tan60°-
+(
)-1+(-2007)0
=
-(
+1)+2+1
=2;
(2) 6tan230°-
sin 60°-2sin 45°
=6×(
)2-
×
-2×
=2-
-
=
-
.
| 2 | ||
|
| 1 |
| 2 |
=
| 3 |
| 3 |
=2;
(2) 6tan230°-
| 3 |
=6×(
| ||
| 3 |
| 3 |
| ||
| 2 |
| ||
| 2 |
=2-
| 3 |
| 2 |
| 2 |
=
| 1 |
| 2 |
| 2 |
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