问题 解答题
计算:
cos45°+sin30°
sin30°•tan45°
+
tan260°-2tan60°+1
答案

原式=

2
2
+
1
2
1
2
×
2
2
+
(tan60°-1)2

=

2
+1
2
2
4
+
3
-1

=

2
+1
2
×
4
2
+
3
-1

=2+

2
+
3
-1

=1+

2
+
3

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