问题 解答题
计算下列各题:
(1)sin230°+cos245°+
2
sin60°•tan45°;
(2)
12
-4sin60°+(tan30°+1)0
答案

(1)原式=(

1
2
2+(
2
2
2+
2
×
3
2
×1

=

1
4
+
1
2
+
6
2

=

3
4
+
1
2
6

(2)原式=2

3
-4×
3
2
+1

=2

3
-2
3
+1

=1.

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