问题
解答题
计算: (1)3tan30°-2tan45°+2sin60°+4cos60°; (2)
|
答案
(1)原式=3×
-2+2×3 3
+4×3 2 1 2
=
-2+3
+23
=2
;3
(2)原式=
-3 2 3 1+ 1 2
=
-23 3 3
=-
.3 3
计算: (1)3tan30°-2tan45°+2sin60°+4cos60°; (2)
|
(1)原式=3×
-2+2×3 3
+4×3 2 1 2
=
-2+3
+23
=2
;3
(2)原式=
-3 2 3 1+ 1 2
=
-23 3 3
=-
.3 3