问题
解答题
计算:(1)4cos60°+(
(2)tan45°-2sin30°+4cos45° |
答案
(1)原式=4×
+1 2
-11 (
)21 2
=2+4-1
=5.
(2)原式=1-2×
+4×1 2 2 2
=1-1+22
=2
.2
计算:(1)4cos60°+(
(2)tan45°-2sin30°+4cos45° |
(1)原式=4×
+1 2
-11 (
)21 2
=2+4-1
=5.
(2)原式=1-2×
+4×1 2 2 2
=1-1+22
=2
.2