问题
解答题
计算:(1)2sin30°-2cos60°+tan45° (2)-12×
|
答案
(1)2sin30°-2cos60°+tan45°
=2×
1 |
2 |
1 |
2 |
=1-1+1=1;
(2)原式=-1×3
3 |
3 |
1 |
2 |
=1.
计算:(1)2sin30°-2cos60°+tan45° (2)-12×
|
(1)2sin30°-2cos60°+tan45°
=2×
1 |
2 |
1 |
2 |
=1-1+1=1;
(2)原式=-1×3
3 |
3 |
1 |
2 |
=1.