问题
解答题
计算: (1)
(2)
|
答案
(1)
(2cos45°-sin60°)+2
,24 4
=
(2×2
-2 2
)+3 2
,24 4
=2-
+6 2
,6 2
=2.
(2)
sin45°+cos30°•tan60°-2
,(-3)2
=
×2
+2 2
×3 2
-33
=1+
-3,3 2
=-
.1 2
计算: (1)
(2)
|
(1)
(2cos45°-sin60°)+2
,24 4
=
(2×2
-2 2
)+3 2
,24 4
=2-
+6 2
,6 2
=2.
(2)
sin45°+cos30°•tan60°-2
,(-3)2
=
×2
+2 2
×3 2
-33
=1+
-3,3 2
=-
.1 2