计算：cos45°+sin30°sin30°•tan45°+tan260°-2tan60°+1．

题型：不详难度：来源：

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

．