问题
解答题
计算: (1)6cos30°×tan30°-2sin245°; (2)3
|
答案
(1)原式=6×
×3 2
-2×(3 3
)2,2 2
=3-2×
,1 2
=2.
(2)3
-(π-1)0-2sin45°+tan45°,2
=3
-1-2×2
+1,2 2
=3
-1-2
+1,2
=2
.2
计算: (1)6cos30°×tan30°-2sin245°; (2)3
|
(1)原式=6×
×3 2
-2×(3 3
)2,2 2
=3-2×
,1 2
=2.
(2)3
-(π-1)0-2sin45°+tan45°,2
=3
-1-2×2
+1,2 2
=3
-1-2
+1,2
=2
.2